Cold front

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<H1 id="firstHeading" class="firstHeading" lang="en">Cold front</H1>			<DIV id="bodyContent" class="mw-body-content">
				<DIV id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</DIV>				<DIV id="contentSub"></DIV>
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				<DIV id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><DIV class="mw-parser-output"><DIV role="note" class="hatnote navigation-not-searchable">Not to be confused with <A href="/wiki/Cold_wave" title="Cold wave">Cold wave</A>.</DIV>
<DIV class="thumb tright"><DIV class="thumbinner" style="width:222px;"><A href="/wiki/File:Cold_front_symbol.svg" class="image"><IMG alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Cold_front_symbol.svg/220px-Cold_front_symbol.svg.png" width="220" height="30" class="thumbimage" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Cold_front_symbol.svg/330px-Cold_front_symbol.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Cold_front_symbol.svg/440px-Cold_front_symbol.svg.png 2x" data-file-width="440" data-file-height="60" /></A>  <DIV class="thumbcaption"><DIV class="magnify"><A href="/wiki/File:Cold_front_symbol.svg" class="internal" title="Enlarge"></A></DIV>The symbol of a cold front: a blue line with triangles pointing in the direction of travel</DIV></DIV></DIV>
<DIV class="thumb tright"><DIV class="thumbinner" style="width:222px;"><A href="/wiki/File:Retreating_cold_front.jpg" class="image"><IMG alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/Retreating_cold_front.jpg/220px-Retreating_cold_front.jpg" width="220" height="165" class="thumbimage" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/Retreating_cold_front.jpg/330px-Retreating_cold_front.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a2/Retreating_cold_front.jpg/440px-Retreating_cold_front.jpg 2x" data-file-width="2048" data-file-height="1536" /></A>  <DIV class="thumbcaption"><DIV class="magnify"><A href="/wiki/File:Retreating_cold_front.jpg" class="internal" title="Enlarge"></A></DIV>A retreating cold front with clear air behind</DIV></DIV></DIV>
<DIV class="thumb tright"><DIV class="thumbinner" style="width:272px;"><A href="/wiki/File:Cold_Front.jpg" class="image"><IMG alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Cold_Front.jpg/270px-Cold_Front.jpg" width="270" height="238" class="thumbimage" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Cold_Front.jpg/405px-Cold_Front.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Cold_Front.jpg/540px-Cold_Front.jpg 2x" data-file-width="2237" data-file-height="1968" /></A>  <DIV class="thumbcaption"><DIV class="magnify"><A href="/wiki/File:Cold_Front.jpg" class="internal" title="Enlarge"></A></DIV>A cold front over the eastern and central region of the United States of America</DIV></DIV></DIV>
<P>A <B>cold front</B> is the leading edge of a cooler mass of air, replacing at ground level a warmer mass of air, which lies within a fairly sharp surface <A href="/wiki/Trough_(meteorology)" title="Trough (meteorology)">trough</A> of <A href="/wiki/Low-pressure_area" title="Low-pressure area">low pressure</A>.  It forms in the wake of an <A href="/wiki/Extratropical_cyclone" title="Extratropical cyclone">extratropical cyclone</A>, at the leading edge of its cold air <A href="/wiki/Advection#Meteorology" title="Advection">advection</A> pattern, which is also known as the <A href="/wiki/Cyclone" title="Cyclone">cyclone</A>'s dry conveyor belt circulation.  Temperature changes across the boundary can exceed 30 °C (54 °F).<SUP id="cite_ref-1" class="reference"><A href="#cite_note-1">[1]</A></SUP>  When enough moisture is present, rain can occur along the boundary.  If there is significant instability along the boundary, a narrow line of thunderstorms can form along the frontal zone.  If instability is less, a broad shield of rain can move in behind the <A href="/wiki/Weather_front" title="Weather front">front</A>, which increases the temperature difference across the boundary.  Cold fronts are stronger in the fall and spring transition seasons and weakest during the summer.
</P>
<DIV id="toc" class="toc"><INPUT type="checkbox" role="button" id="toctogglecheckbox" class="toctogglecheckbox" style="display:none" /><DIV class="toctitle" lang="en" dir="ltr"><H2>Contents</H2><SPAN class="toctogglespan"><LABEL class="toctogglelabel" for="toctogglecheckbox"></LABEL></SPAN></DIV>
<UL>
<LI class="toclevel-1 tocsection-1"><A href="#Development_of_cold_fronts"><SPAN class="tocnumber">1</SPAN> <SPAN class="toctext">Development of cold fronts</SPAN></A></LI>
<LI class="toclevel-1 tocsection-2"><A href="#Clouds"><SPAN class="tocnumber">2</SPAN> <SPAN class="toctext">Clouds</SPAN></A></LI>
<LI class="toclevel-1 tocsection-3"><A href="#Precipitation"><SPAN class="tocnumber">3</SPAN> <SPAN class="toctext">Precipitation</SPAN></A>
<UL>
<LI class="toclevel-2 tocsection-4"><A href="#Frontogenetical_circulation"><SPAN class="tocnumber">3.1</SPAN> <SPAN class="toctext">Frontogenetical circulation</SPAN></A></LI>
</UL>
</LI>
<LI class="toclevel-1 tocsection-5"><A href="#Temperature_changes"><SPAN class="tocnumber">4</SPAN> <SPAN class="toctext">Temperature changes</SPAN></A></LI>
<LI class="toclevel-1 tocsection-6"><A href="#Characteristics_of_boundaries_around_an_extratropical_cyclone"><SPAN class="tocnumber">5</SPAN> <SPAN class="toctext">Characteristics of boundaries around an extratropical cyclone</SPAN></A></LI>
<LI class="toclevel-1 tocsection-7"><A href="#See_also"><SPAN class="tocnumber">6</SPAN> <SPAN class="toctext">See also</SPAN></A></LI>
<LI class="toclevel-1 tocsection-8"><A href="#References"><SPAN class="tocnumber">7</SPAN> <SPAN class="toctext">References</SPAN></A></LI>
<LI class="toclevel-1 tocsection-9"><A href="#External_links"><SPAN class="tocnumber">8</SPAN> <SPAN class="toctext">External links</SPAN></A></LI>
</UL>
</DIV>

<H2><SPAN class="mw-headline" id="Development_of_cold_fronts">Development of cold fronts</SPAN><SPAN class="mw-editsection"><SPAN class="mw-editsection-bracket">[</SPAN><A href="/w/index.php?title=Cold_front&action=edit&section=1" title="Edit section: Development of cold fronts">edit</A><SPAN class="mw-editsection-bracket">]</SPAN></SPAN></H2>
<P>The cooler and denser air wedges under the less-dense warmer air, lifting it. This upward motion causes lowered <A href="/wiki/Pressure" title="Pressure">pressure</A> along the cold front and can cause the formation of a narrow line of <A href="/wiki/Shower" title="Shower">showers</A> and <A href="/wiki/Thunderstorm" title="Thunderstorm">thunderstorms</A> when enough <A href="/wiki/Moisture" title="Moisture">moisture</A> is present. On <A href="/wiki/Weather_map" title="Weather map">weather maps</A>, the surface position of the cold front is marked with the symbol of a blue line of triangles/spikes (pips) pointing in the direction of travel. A cold front's location is at the leading edge of the <A href="/wiki/Temperature" title="Temperature">temperature</A> drop off, which in an <A href="/wiki/Contour_line#Temperature_and_related_subjects" title="Contour line">isotherm</A> analysis would show up as the leading edge of the isotherm gradient, and it normally lies within a sharp surface <A href="/wiki/Trough_(meteorology)" title="Trough (meteorology)">trough</A>.<SUP id="cite_ref-DR_2-0" class="reference"><A href="#cite_note-DR-2">[2]</A></SUP> Cold fronts move faster than <A href="/wiki/Warm_front" title="Warm front">warm fronts</A> and can produce sharper changes in weather.  Since cold air is denser than warm air, it rapidly replaces the warm air preceding the boundary.<SUP id="cite_ref-3" class="reference"><A href="#cite_note-3">[3]</A></SUP>
</P><P>In the northern hemisphere, a cold front usually causes a shift of wind from southwest to northwest clockwise, also known as veering, and in the southern hemisphere a shift from northwest to southwest (anticlockwise, backing). Normally, cold fronts can be marked by these characteristics:
</P>
<TABLE class="wikitable">

<TBODY><TR>
<TH>Weather phenomenon
</TH>
<TH>Prior to the passing of the <A href="/wiki/Weather_front" title="Weather front">front</A>
</TH>
<TH>While the front is passing
</TH>
<TH>After the passing of the front
</TH></TR>
<TR>
<TD>Temperature
</TD>
<TD>Warm
</TD>
<TD>Cooling suddenly
</TD>
<TD>Steadily cooling
</TD></TR>
<TR>
<TD><A href="/wiki/Atmospheric_pressure" title="Atmospheric pressure">Atmospheric pressure</A>
</TD>
<TD>Decreasing steadily
</TD>
<TD>Lowest, then sudden increase
</TD>
<TD>Increasing steadily
</TD></TR>
<TR>
<TD>Winds
</TD>
<TD>
<UL><LI>Southwest to southeast (northern hemisphere)</LI>
<LI>Northwest to northeast (southern hemisphere)</LI></UL>
</TD>
<TD>Gusty; shifting
</TD>
<TD>
<UL><LI>North to west, usually northwest (northern hemisphere)</LI>
<LI>South to west, usually southwest (southern hemisphere)</LI></UL>
</TD></TR>
<TR>
<TD>Precipitation/conditions*
</TD>
<TD>Light patchy rain can be produced by stratocumulus or stratus in the warm sector. In summer, sometimes thunderstorms if a preceding <A href="/wiki/Squall_line" title="Squall line">squall line</A> is present.
</TD>
<TD>Prolonged rain (nimbostratus) or <A href="/wiki/Thunderstorms" class="mw-redirect" title="Thunderstorms">thunderstorms</A> (cumulonimbus): depends on conditions.
</TD>
<TD>Showers, then clearing
</TD></TR>
<TR>
<TD>Clouds*
</TD>
<TD>Often preceded by cirrus, <A href="/wiki/Cirrostratus" class="mw-redirect" title="Cirrostratus">cirrostratus</A> then altostratus like a warm front (but usually with smaller amounts of these clouds). Areas of cirrocumulus and altocumulus within cirrostratus and altostratus more commonly seen than at a warm front. Larger cumulus clouds under the higher cloud types than at a warm front, where stratocumulus and cumulus humilis usually occur. Some of these cumulus clouds may produce showers ahead of the front.
</TD>
<TD>Cumulonimbus and cumulus congestus producing frequent showers, with a sheet of upper altostratus, through which the sun can sometimes be seen. Less commonly nimbostratus occurs with continuous rain.
</TD>
<TD>Patchy <A href="/wiki/Altocumulus" class="mw-redirect" title="Altocumulus">altocumulus</A> or <A href="/wiki/Stratocumulus" class="mw-redirect" title="Stratocumulus">stratocumulus</A> and higher <A href="/wiki/Cirrus_cloud" title="Cirrus cloud">cirrus</A> clouds along with fast moving <A href="/wiki/Stratus_fractus" class="mw-redirect" title="Stratus fractus">stratus fractus</A> then eventually scattered <A href="/wiki/Cumulus" class="mw-redirect" title="Cumulus">cumulus</A> and sometimes <A href="/wiki/Cumulonimbus" class="mw-redirect" title="Cumulonimbus">cumulonimbus</A>.
</TD></TR>
<TR>
<TD>Visibility*
</TD>
<TD>Fair to poor in <A href="/wiki/Haze" title="Haze">haze</A>
</TD>
<TD>Poor, but improving
</TD>
<TD>Good, except in showers
</TD></TR>
<TR>
<TD>Dew Point
</TD>
<TD>High, steady
</TD>
<TD>Sudden drop
</TD>
<TD>Falling
</TD></TR></TBODY></TABLE>
<P>*provided there is sufficient moisture.
</P>
<H2><SPAN class="mw-headline" id="Clouds">Clouds</SPAN><SPAN class="mw-editsection"><SPAN class="mw-editsection-bracket">[</SPAN><A href="/w/index.php?title=Cold_front&action=edit&section=2" title="Edit section: Clouds">edit</A><SPAN class="mw-editsection-bracket">]</SPAN></SPAN></H2>
<P>If the cold front is highly unstable, <A href="/wiki/Cumulonimbus_cloud" title="Cumulonimbus cloud">cumulonimbus clouds</A> producing thunderstorms commonly form along the front. <A href="/wiki/Cumulonimbus_incus" title="Cumulonimbus incus">Anvil</A> <A href="/wiki/Cirrus_cloud" title="Cirrus cloud">cirrus clouds</A> may spread a considerable distance downwind from the thunderstorms.<SUP id="cite_ref-G&N:207-212_4-0" class="reference"><A href="#cite_note-G&N:207-212-4">[4]</A></SUP> The other cloud types associated with a cold front depend on atmospheric conditions such as air mass stability and wind shear.<SUP id="cite_ref-Holt_5-0" class="reference"><A href="#cite_note-Holt-5">[5]</A></SUP>  As the front approaches, middle-étage gives way to <A href="/wiki/Altostratus" class="mw-redirect" title="Altostratus">altostratus</A> and low-level <A href="/wiki/Stratocumulus" class="mw-redirect" title="Stratocumulus">stratocumulus</A> with intermittent light precipitation if the warm airmass being displaced by the cold front is mostly stable. With significant airmass instability, vertically developed <A href="/wiki/Cumulus" class="mw-redirect" title="Cumulus">cumulus</A> or cumulonimbus with showers and thunderstorms will form along the front.
</P><P>After the passage of the cold front, the sky usually clears as high pressure builds in behind the system, although significant amounts of cumulus or stratocumulus, often in the form of long bands called <I>cloud streets</I> may persist if the air mass behind the front remains humid.<SUP id="cite_ref-Weston437-438_6-0" class="reference"><A href="#cite_note-Weston437-438-6">[6]</A></SUP> Small and unchanging amounts of cumulus or cirrus clouds in an otherwise clear sky are usually indications of continuing fair weather as long as the <A href="/wiki/Barometric_pressure" class="mw-redirect" title="Barometric pressure">barometric pressure</A> remains comparatively high.
</P>
<H2><SPAN class="mw-headline" id="Precipitation">Precipitation</SPAN><SPAN class="mw-editsection"><SPAN class="mw-editsection-bracket">[</SPAN><A href="/w/index.php?title=Cold_front&action=edit&section=3" title="Edit section: Precipitation">edit</A><SPAN class="mw-editsection-bracket">]</SPAN></SPAN></H2>
<DIV class="thumb tright"><DIV class="thumbinner" style="width:277px;"><A href="/wiki/File:Radar_image_of_severe_thunderstorms_and_cold_front_over_Marion_County,_Kansas.png" class="image"><IMG alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Radar_image_of_severe_thunderstorms_and_cold_front_over_Marion_County%2C_Kansas.png/275px-Radar_image_of_severe_thunderstorms_and_cold_front_over_Marion_County%2C_Kansas.png" width="275" height="233" class="thumbimage" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Radar_image_of_severe_thunderstorms_and_cold_front_over_Marion_County%2C_Kansas.png/413px-Radar_image_of_severe_thunderstorms_and_cold_front_over_Marion_County%2C_Kansas.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Radar_image_of_severe_thunderstorms_and_cold_front_over_Marion_County%2C_Kansas.png/550px-Radar_image_of_severe_thunderstorms_and_cold_front_over_Marion_County%2C_Kansas.png 2x" data-file-width="799" data-file-height="678" /></A>  <DIV class="thumbcaption"><DIV class="magnify"><A href="/wiki/File:Radar_image_of_severe_thunderstorms_and_cold_front_over_Marion_County,_Kansas.png" class="internal" title="Enlarge"></A></DIV>A cold front as it appeared on the <A href="/wiki/National_Weather_Service_Wichita,_Kansas" title="National Weather Service Wichita, Kansas">National Weather Service Wichita, Kansas</A> <A href="/wiki/WSR-88D" class="mw-redirect" title="WSR-88D">WSR-88D</A> on April 3, 2011. The thin blue line labeled "cold front" is the front, with severe thunderstorms seen developing behind the front, which is moving towards the bottom right.</DIV></DIV></DIV>
<P>A cold front commonly brings a narrow band of <A href="/wiki/Precipitation_(meteorology)" class="mw-redirect" title="Precipitation (meteorology)">precipitation</A> that follows along the leading edge of the cold front. These bands of precipitation are often very strong,<SUP id="cite_ref-7" class="reference"><A href="#cite_note-7">[7]</A></SUP> and can bring severe thunderstorms, <A href="/wiki/Hail" title="Hail">hailstorms</A><SUP id="cite_ref-8" class="reference"><A href="#cite_note-8">[8]</A></SUP> and/or <A href="/wiki/Tornado" title="Tornado">tornadoes</A>. In the spring, these cold fronts can be very strong, and can bring strong winds when the <A href="/wiki/Pressure_gradient" title="Pressure gradient">pressure gradient</A> is higher than normal. During the winter months, cold fronts sometimes come through an area with little or no precipitation.  Wider rain bands can occur behind cold fronts which tend to have more stratiform, and less convective, precipitation.<SUP id="cite_ref-9" class="reference"><A href="#cite_note-9">[9]</A></SUP>  These rainstorms sometimes bring <A href="/wiki/Flood" title="Flood">flooding</A>, and can move very slowly when the storm steering it is strong and embedded within a <A href="/wiki/Meridional_flow" class="mw-redirect" title="Meridional flow">meridional flow</A> pattern (with more pole to equator motion rather than west to east motion). In the winter, cold fronts can bring cold spells, and occasionally snow. In the spring or summer in temperate latitudes, hail may occasionally fall along with the rain.  If moisture is not sufficient, such as when a system has previously moved across a mountain barrier, cold fronts can pass without cloudiness.
</P>
<H3><SPAN class="mw-headline" id="Frontogenetical_circulation">Frontogenetical circulation</SPAN><SPAN class="mw-editsection"><SPAN class="mw-editsection-bracket">[</SPAN><A href="/w/index.php?title=Cold_front&action=edit&section=4" title="Edit section: Frontogenetical circulation">edit</A><SPAN class="mw-editsection-bracket">]</SPAN></SPAN></H3>
<P><A href="/wiki/Frontogenesis" title="Frontogenesis">Frontogenesis</A> is the process of creating or steepening the temperature gradient of a front. During this process the atmosphere reacts in an attempt to restore balance, the consequence is a circular motion along the front where air is being lifted up, along the cold front and dropping downward, behind the frontal boundary. This is the actual force of upward motion along a front that is responsible for clouds and precipitation.
</P><P>As the temperature gradient steepens during frontogenesis, the <A href="/wiki/Thermal_wind" title="Thermal wind">thermal wind</A> becomes imbalanced. To maintain balance, the <A href="/wiki/Geostrophic_wind" title="Geostrophic wind">geostrophic wind</A> aloft and below adjust, such that regions of divergence/convergence form. <A href="/wiki/Continuity_equation" title="Continuity equation">Mass continuity</A> would require a vertical transport of air along the cold front where there is divergence (lowered <A href="/wiki/Pressure" title="Pressure">pressure</A>). Although this circulation is described by a series of processes, they are actually occurring at the same time, observable along the front as a thermally direct circulation. There are several factors that influence the final shape and tilt of the circulation around the front, ultimately determining the kind and location of clouds and precipitation.<SUP id="cite_ref-Holt_5-1" class="reference"><A href="#cite_note-Holt-5">[5]</A></SUP><SUP id="cite_ref-Carl_10-0" class="reference"><A href="#cite_note-Carl-10">[10]</A></SUP>
</P>
<H2><SPAN class="mw-headline" id="Temperature_changes">Temperature changes</SPAN><SPAN class="mw-editsection"><SPAN class="mw-editsection-bracket">[</SPAN><A href="/w/index.php?title=Cold_front&action=edit&section=5" title="Edit section: Temperature changes">edit</A><SPAN class="mw-editsection-bracket">]</SPAN></SPAN></H2>
<P>Cold fronts are the leading edge of cooler air masses, hence the name "cold front". They have stronger temperature changes during the <A href="/wiki/Autumn" title="Autumn">fall</A> (autumn) and spring and during the middle of winter.  Temperature changes associated with cold fronts can be as much as 50 °F (30 °C).  When cold fronts come through, there is usually a quick, yet strong gust of wind, that shows that the cold front is passing.  In <A href="/wiki/Surface_weather_observation" title="Surface weather observation">surface weather observations</A>, a remark known as FROPA is coded when this occurs.<SUP id="cite_ref-11" class="reference"><A href="#cite_note-11">[11]</A></SUP>  The effects from a cold front can last from hours to days. The air behind the front is cooler than the air it is replacing and the warm air is forced to rise, so it cools.  As the cooler air cannot hold as much moisture as warm air, clouds form and rain occurs.
</P>
<H2><SPAN class="mw-headline" id="Characteristics_of_boundaries_around_an_extratropical_cyclone">Characteristics of boundaries around an extratropical cyclone</SPAN><SPAN class="mw-editsection"><SPAN class="mw-editsection-bracket">[</SPAN><A href="/w/index.php?title=Cold_front&action=edit&section=6" title="Edit section: Characteristics of boundaries around an extratropical cyclone">edit</A><SPAN class="mw-editsection-bracket">]</SPAN></SPAN></H2>
<DIV class="thumb tright"><DIV class="thumbinner" style="width:222px;"><A href="/wiki/File:Occluded_cyclone.svg" class="image"><IMG alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Occluded_cyclone.svg/220px-Occluded_cyclone.svg.png" width="220" height="170" class="thumbimage" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Occluded_cyclone.svg/330px-Occluded_cyclone.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/90/Occluded_cyclone.svg/440px-Occluded_cyclone.svg.png 2x" data-file-width="710" data-file-height="550" /></A>  <DIV class="thumbcaption"><DIV class="magnify"><A href="/wiki/File:Occluded_cyclone.svg" class="internal" title="Enlarge"></A></DIV><A href="/wiki/Occluded_front" title="Occluded front">Occluded cyclone</A> example. The triple point is the intersection of the cold, warm, and occluded fronts.</DIV></DIV></DIV>
<P>Cold fronts form when a cooler air mass moves into an area of warmer air in the wake of a developing extratropical cyclone. The warmer air interacts with the cooler air mass along the boundary, and usually produces precipitation.  Cold fronts often follow a <A href="/wiki/Warm_front" title="Warm front">warm front</A> or squall line. Very commonly, cold fronts have a warm front ahead but with a perpendicular orientation.  In areas where cold fronts catch up to the warm front, the <A href="/wiki/Occluded_front" title="Occluded front">occluded front</A> develops.  Occluded fronts have an area of warm air aloft.  When such a feature forms poleward of an extratropical cyclone, it is known as a <B><A href="/wiki/Trowal" class="mw-redirect" title="Trowal">trowal</A></B>, which is short for <B>TR</B>ough <B>O</B>f <B>W</B>arm <B>A</B>ir a<B>L</B>oft.<SUP id="cite_ref-TROW_12-0" class="reference"><A href="#cite_note-TROW-12">[12]</A></SUP>  A cold front is considered a <A href="/wiki/Warm_front" title="Warm front">warm front</A> if it begins to retreat ahead of the next extratropical cyclone along the frontal boundary, and called a <A href="/wiki/Stationary_front" title="Stationary front">stationary front</A> if it stalls.
</P>
<H2><SPAN class="mw-headline" id="See_also">See also</SPAN><SPAN class="mw-editsection"><SPAN class="mw-editsection-bracket">[</SPAN><A href="/w/index.php?title=Cold_front&action=edit&section=7" title="Edit section: See also">edit</A><SPAN class="mw-editsection-bracket">]</SPAN></SPAN></H2>
<UL><LI><A href="/wiki/Cold_wave" title="Cold wave">Cold wave</A></LI>
<LI><A href="/wiki/Air_mass" title="Air mass">Air mass</A></LI>
<LI><A href="/wiki/Surface_weather_analysis" title="Surface weather analysis">Surface weather analysis</A></LI>
<LI><A href="/wiki/Texas_Norther" class="mw-redirect" title="Texas Norther">Texas Norther</A></LI>
<LI><A href="/wiki/Weather_front" title="Weather front">Weather front</A></LI></UL>
<H2><SPAN class="mw-headline" id="References">References</SPAN><SPAN class="mw-editsection"><SPAN class="mw-editsection-bracket">[</SPAN><A href="/w/index.php?title=Cold_front&action=edit&section=8" title="Edit section: References">edit</A><SPAN class="mw-editsection-bracket">]</SPAN></SPAN></H2>
<DIV class="reflist" style="list-style-type: decimal;">
<DIV class="mw-references-wrap mw-references-columns"><OL class="references">
<LI id="cite_note-1"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-1"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text"><CITE class="citation web"><A rel="nofollow" class="external text" href="http://www.climate.umn.edu/doc/journal/cold_december_2013.htm">"Cold December: 2013"</A>. <I>www.climate.umn.edu</I><SPAN class="reference-accessdate">. Retrieved <SPAN class="nowrap">20 January</SPAN> 2018</SPAN>.</CITE><SPAN title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.climate.umn.edu&rft.atitle=Cold+December%3A+2013&rft_id=http%3A%2F%2Fwww.climate.umn.edu%2Fdoc%2Fjournal%2Fcold_december_2013.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACold+front" class="Z3988"></SPAN><STYLE data-mw-deduplicate="TemplateStyles:r861714446">.mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"\"""\"""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}</STYLE></SPAN>
</LI>
<LI id="cite_note-DR-2"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-DR_2-0"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text"><CITE class="citation web">David Roth (2006-12-14). <A rel="nofollow" class="external text" href="http://www.wpc.ncep.noaa.gov/sfc/UASfcManualVersion1.pdf">"Unified Surface Analysis Manual"</A> <SPAN class="cs1-format">(PDF)</SPAN>. <A href="/wiki/Hydrometeorological_Prediction_Center" class="mw-redirect" title="Hydrometeorological Prediction Center">Hydrometeorological Prediction Center</A><SPAN class="reference-accessdate">. Retrieved <SPAN class="nowrap">2012-01-09</SPAN></SPAN>.</CITE><SPAN title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Unified+Surface+Analysis+Manual&rft.pub=Hydrometeorological+Prediction+Center&rft.date=2006-12-14&rft.au=David+Roth&rft_id=http%3A%2F%2Fwww.wpc.ncep.noaa.gov%2Fsfc%2FUASfcManualVersion1.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACold+front" class="Z3988"></SPAN><LINK rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r861714446" /></SPAN>
</LI>
<LI id="cite_note-3"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-3"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text"><CITE class="citation book">Paul M. Markowski; Yvette P. Richardson (2011-09-20). <A rel="nofollow" class="external text" href="https://books.google.com/books?id=MDeYosfLLEYC&pg=PA119&lpg=PA119&dq=cold+front+movement+warm+front+book&source=bl&ots=faJzqA1vmS&sig=L0fxKFEeIg2t86M-7gtCiYpeVuE&hl=en&sa=X&ei=lK8LT63oOory0gGMvoiVBg&ved=0CEYQ6AEwBg#v=onepage&q=cold%20front%20movement%20warm%20front%20book&f=false"><I>Mesoscale Meteorology in Midlatitudes</I></A>. John Wiley and Sons. p. 120. <A href="/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</A> <A href="/wiki/Special:BookSources/978-1-119-96667-8" title="Special:BookSources/978-1-119-96667-8">978-1-119-96667-8</A><SPAN class="reference-accessdate">. Retrieved <SPAN class="nowrap">2012-01-09</SPAN></SPAN>.</CITE><SPAN title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Mesoscale+Meteorology+in+Midlatitudes&rft.pages=120&rft.pub=John+Wiley+and+Sons&rft.date=2011-09-20&rft.isbn=978-1-119-96667-8&rft.au=Paul+M.+Markowski&rft.au=Yvette+P.+Richardson&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DMDeYosfLLEYC%26pg%3DPA119%26lpg%3DPA119%26dq%3Dcold%2Bfront%2Bmovement%2Bwarm%2Bfront%2Bbook%26source%3Dbl%26ots%3DfaJzqA1vmS%26sig%3DL0fxKFEeIg2t86M-7gtCiYpeVuE%26hl%3Den%26sa%3DX%26ei%3DlK8LT63oOory0gGMvoiVBg%26ved%3D0CEYQ6AEwBg%23v%3Donepage%26q%3Dcold%2520front%2520movement%2520warm%2520front%2520book%26f%3Dfalse&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACold+front" class="Z3988"></SPAN><LINK rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r861714446" /></SPAN>
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<LI id="cite_note-G&N:207-212-4"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-G&N:207-212_4-0"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text"><CITE class="citation book">Lee M. Grenci; Jon M. Nese (2001). <A rel="nofollow" class="external text" href="https://books.google.com/?id=oh8lqM5obuYC&pg=PA212"><I>A World of Weather: Fundamentals of Meteorology: A Text / Laboratory Manual</I></A> (3 ed.). Kendall/Hunt Publishing Company. pp. 207–212. <A href="/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</A> <A href="/wiki/Special:BookSources/978-0-7872-7716-1" title="Special:BookSources/978-0-7872-7716-1">978-0-7872-7716-1</A>. <A href="/wiki/OCLC" title="OCLC">OCLC</A> <A rel="nofollow" class="external text" href="//www.worldcat.org/oclc/51160155">51160155</A>.</CITE><SPAN title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=A+World+of+Weather%3A+Fundamentals+of+Meteorology%3A+A+Text+%2F+Laboratory+Manual&rft.pages=207-212&rft.edition=3&rft.pub=Kendall%2FHunt+Publishing+Company&rft.date=2001&rft_id=info%3Aoclcnum%2F51160155&rft.isbn=978-0-7872-7716-1&rft.au=Lee+M.+Grenci&rft.au=Jon+M.+Nese&rft_id=https%3A%2F%2Fbooks.google.com%2F%3Fid%3Doh8lqM5obuYC%26pg%3DPA212&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACold+front" class="Z3988"></SPAN><LINK rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r861714446" /></SPAN>
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<LI id="cite_note-Holt-5"><SPAN class="mw-cite-backlink">^ <A href="#cite_ref-Holt_5-0"><SPAN class="cite-accessibility-label">Jump up to: </SPAN><SUP><I><B>a</B></I></SUP></A> <A href="#cite_ref-Holt_5-1"><SUP><I><B>b</B></I></SUP></A></SPAN> <SPAN class="reference-text"><A rel="nofollow" class="external text" href="https://books.google.com/books?id=fhW5oDv3EPsC&lpg=PP1&pg=PA277#v=onepage&q&f=false">Preview Text</A>, Holton, James R., 2004: An Introduction to Dynamic Meteorology. Academic Press, 277 pp.</SPAN>
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<LI id="cite_note-Weston437-438-6"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-Weston437-438_6-0"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text"><CITE class="citation journal">Weston, K. J. (1980). "An observational study of convective cloud streets". <I>Tellus</I>. <B>32</B> (5): 433. <A href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</A>:<A rel="nofollow" class="external text" href="//doi.org/10.1111%2Fj.2153-3490.1980.tb00970.x">10.1111/j.2153-3490.1980.tb00970.x</A>.</CITE><SPAN title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Tellus&rft.atitle=An+observational+study+of+convective+cloud+streets&rft.volume=32&rft.issue=5&rft.pages=433&rft.date=1980&rft_id=info%3Adoi%2F10.1111%2Fj.2153-3490.1980.tb00970.x&rft.aulast=Weston&rft.aufirst=K.+J.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACold+front" class="Z3988"></SPAN><LINK rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r861714446" /></SPAN>
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<LI id="cite_note-7"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-7"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text">Glossary of Meteorology (2009). <A rel="nofollow" class="external text" href="http://amsglossary.allenpress.com/glossary/search?id=prefrontal-squall-line1">Prefrontal squall line.</A> Retrieved on 2008-12-24.</SPAN>
</LI>
<LI id="cite_note-8"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-8"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text"><CITE class="citation journal">Schemm, S.; L. Nisi, A. Martinov; D. Leuenberg & O. Martius (2016). <A rel="nofollow" class="external text" href="http://onlinelibrary.wiley.com/doi/10.1002/asl.660/abstract">"On the link between cold fronts and hail in Switzerland"</A>. <I>Atmospheric Science Letters</I>. <B>17</B> (5): 315–325. <A href="/wiki/Digital_object_identifier" title="Digital object identifier">doi</A>:<A rel="nofollow" class="external text" href="//doi.org/10.1002%2Fasl.660">10.1002/asl.660</A>.</CITE><SPAN title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Atmospheric+Science+Letters&rft.atitle=On+the+link+between+cold+fronts+and+hail+in+Switzerland&rft.volume=17&rft.issue=5&rft.pages=315-325&rft.date=2016&rft_id=info%3Adoi%2F10.1002%2Fasl.660&rft.au=Schemm%2C+S.&rft.au=L.+Nisi%2C+A.+Martinov&rft.au=D.+Leuenberg&rft.au=O.+Martius&rft_id=http%3A%2F%2Fonlinelibrary.wiley.com%2Fdoi%2F10.1002%2Fasl.660%2Fabstract&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACold+front" class="Z3988"></SPAN><LINK rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r861714446" /></SPAN>
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<LI id="cite_note-9"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-9"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text">K. A. Browning and Robert J. Gurney (1999). <A rel="nofollow" class="external text" href="https://books.google.com/books?id=DO5K1NK_ZewC&pg=PA116&lpg=PA116&dq=when+do+wide+rain+bands+form+near+cold+fronts%3F&source=web&ots=j2xQaps00_&sig=SSYUXEW1H4QDe4UI0K3T0WIW6Tk&hl=en&sa=X&oi=book_result&resnum=9&ct=result#PPA117,M1">Global Energy and Water Cycles.</A> Retrieved on 2008-12-26.</SPAN>
</LI>
<LI id="cite_note-Carl-10"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-Carl_10-0"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text"><A rel="nofollow" class="external text" href="https://books.google.com/books?id=2lIVAAAAIAAJ&pg=PA435&dq=Carlson,+Toby+N.,+1991:+Mid-Latitude+Weather+Systems&hl=en&ei=j7LdS6OgMITKMajZiMsH&sa=X&oi=book_result&ct=result&resnum=1&ved=0CEAQ6AEwAA#v=onepage&q&f=false">Preview Text</A>, Carlson, Toby N., 1991: Mid-Latitude Weather Systems. HarperCollins, 435 pp.</SPAN>
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<LI id="cite_note-11"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-11"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text"><CITE class="citation book">Nav Canada (January 2005). <I>Aviation Weather Services Guide</I>. p. 36.</CITE><SPAN title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Aviation+Weather+Services+Guide&rft.pages=36&rft.date=2005-01&rft.au=Nav+Canada&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACold+front" class="Z3988"></SPAN><LINK rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r861714446" /></SPAN>
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<LI id="cite_note-TROW-12"><SPAN class="mw-cite-backlink"><B><A href="#cite_ref-TROW_12-0"><SPAN class="cite-accessibility-label">Jump up </SPAN>^</A></B></SPAN> <SPAN class="reference-text"><CITE class="citation web"><A href="/wiki/St._Louis_University" class="mw-redirect" title="St. Louis University">St. Louis University</A> (2003-08-04). <A rel="nofollow" class="external text" href="https://web.archive.org/web/20060916052440/http://www.eas.slu.edu/CIPS/Presentations/Conferences/NWA2002/Snow_NWA_02/tsld003.htm">"What is a TROWAL? via the Internet Wayback Machine"</A>. Archived from <A rel="nofollow" class="external text" href="http://www.eas.slu.edu/CIPS/Presentations/Conferences/NWA2002/Snow_NWA_02/tsld003.htm">the original</A> on 2006-09-16<SPAN class="reference-accessdate">. Retrieved <SPAN class="nowrap">2006-11-02</SPAN></SPAN>.</CITE><SPAN title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=What+is+a+TROWAL%3F+via+the+Internet+Wayback+Machine&rft.date=2003-08-04&rft.au=St.+Louis+University&rft_id=http%3A%2F%2Fwww.eas.slu.edu%2FCIPS%2FPresentations%2FConferences%2FNWA2002%2FSnow_NWA_02%2Ftsld003.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3ACold+front" class="Z3988"></SPAN><LINK rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r861714446" /></SPAN>
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<UL><LI><A rel="nofollow" class="external text" href="http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/cfrnt/def.rxml">Cold Front: transition zone from warm air to cold air</A></LI>
<LI><A rel="nofollow" class="external text" href="http://serc.carleton.edu/NAGTWorkshops/visualization/collections/weather_fronts.html">Weather Fronts</A></LI>
<LI><A rel="nofollow" class="external text" href="http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/home.rxml">Fronts: the boundaries between air masses</A></LI></UL>
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					<LI class="interlanguage-link interwiki-ar"><A href="https://ar.wikipedia.org/wiki/%D8%AC%D8%A8%D9%87%D8%A9_%D8%A8%D8%A7%D8%B1%D8%AF%D8%A9" title="جبهة باردة – Arabic" lang="ar" hreflang="ar" class="interlanguage-link-target">العربية</A></LI><LI class="interlanguage-link interwiki-bn"><A href="https://bn.wikipedia.org/wiki/%E0%A6%B6%E0%A7%80%E0%A6%A4%E0%A6%B2_%E0%A6%AC%E0%A6%BE%E0%A6%AF%E0%A6%BC%E0%A7%81%E0%A6%B0%E0%A7%87%E0%A6%96%E0%A6%BE" title="শীতল বায়ুরেখা – Bangla" lang="bn" hreflang="bn" class="interlanguage-link-target">বাংলা</A></LI><LI class="interlanguage-link interwiki-be" style="display: none;"><A href="https://be.wikipedia.org/wiki/%D0%A5%D0%B0%D0%BB%D0%BE%D0%B4%D0%BD%D1%8B_%D1%84%D1%80%D0%BE%D0%BD%D1%82" title="Халодны фронт – Belarusian" lang="be" hreflang="be" class="interlanguage-link-target">Беларуская</A></LI><LI class="interlanguage-link interwiki-bg" style="display: none;"><A href="https://bg.wikipedia.org/wiki/%D0%A1%D1%82%D1%83%D0%B4%D0%B5%D0%BD_%D1%84%D1%80%D0%BE%D0%BD%D1%82" title="Студен фронт – Bulgarian" lang="bg" hreflang="bg" class="interlanguage-link-target">Български</A></LI><LI class="interlanguage-link interwiki-ca" style="display: none;"><A href="https://ca.wikipedia.org/wiki/Front_fred" title="Front fred – Catalan" lang="ca" hreflang="ca" class="interlanguage-link-target">Català</A></LI><LI class="interlanguage-link interwiki-cs" style="display: none;"><A href="https://cs.wikipedia.org/wiki/Studen%C3%A1_fronta" title="Studená fronta – Czech" lang="cs" hreflang="cs" class="interlanguage-link-target">Čeština</A></LI><LI class="interlanguage-link interwiki-da" style="display: none;"><A href="https://da.wikipedia.org/wiki/Koldfront" title="Koldfront – Danish" lang="da" hreflang="da" class="interlanguage-link-target">Dansk</A></LI><LI class="interlanguage-link interwiki-de"><A href="https://de.wikipedia.org/wiki/Kaltfront" title="Kaltfront – German" lang="de" hreflang="de" class="interlanguage-link-target">Deutsch</A></LI><LI class="interlanguage-link interwiki-et" style="display: none;"><A href="https://et.wikipedia.org/wiki/K%C3%BClm_front" title="Külm front – Estonian" lang="et" hreflang="et" class="interlanguage-link-target">Eesti</A></LI><LI class="interlanguage-link interwiki-el" style="display: none;"><A href="https://el.wikipedia.org/wiki/%CE%A8%CF%85%CF%87%CF%81%CF%8C_%CE%BC%CE%AD%CF%84%CF%89%CF%80%CE%BF" title="Ψυχρό μέτωπο – Greek" lang="el" hreflang="el" class="interlanguage-link-target">Ελληνικά</A></LI><LI class="interlanguage-link interwiki-eu" style="display: none;"><A href="https://eu.wikipedia.org/wiki/Fronte_hotz" title="Fronte hotz – Basque" lang="eu" hreflang="eu" class="interlanguage-link-target">Euskara</A></LI><LI class="interlanguage-link interwiki-fa" style="display: none;"><A href="https://fa.wikipedia.org/wiki/%D8%AC%D8%A8%D9%87%D9%87_%D8%B3%D8%B1%D8%AF" title="جبهه سرد – Persian" lang="fa" hreflang="fa" class="interlanguage-link-target">فارسی</A></LI><LI class="interlanguage-link interwiki-fr"><A href="https://fr.wikipedia.org/wiki/Front_froid" title="Front froid – French" lang="fr" hreflang="fr" class="interlanguage-link-target">Français</A></LI><LI class="interlanguage-link interwiki-gl" style="display: none;"><A href="https://gl.wikipedia.org/wiki/Fronte_fr%C3%ADa" title="Fronte fría – Galician" lang="gl" hreflang="gl" class="interlanguage-link-target">Galego</A></LI><LI class="interlanguage-link interwiki-ko"><A href="https://ko.wikipedia.org/wiki/%ED%95%9C%EB%9E%AD%EC%A0%84%EC%84%A0" title="한랭전선 – Korean" lang="ko" hreflang="ko" class="interlanguage-link-target">한국어</A></LI><LI class="interlanguage-link interwiki-hr" style="display: none;"><A href="https://hr.wikipedia.org/wiki/Hladna_fronta" title="Hladna fronta – Croatian" lang="hr" hreflang="hr" class="interlanguage-link-target">Hrvatski</A></LI><LI class="interlanguage-link interwiki-lv" style="display: none;"><A href="https://lv.wikipedia.org/wiki/Aukst%C4%81_fronte" title="Aukstā fronte – Latvian" lang="lv" hreflang="lv" class="interlanguage-link-target">Latviešu</A></LI><LI class="interlanguage-link interwiki-ml" style="display: none;"><A href="https://ml.wikipedia.org/wiki/%E0%B4%85%E0%B4%A8%E0%B5%81%E0%B4%B7%E0%B5%8D%E0%B4%A3%E0%B4%B5%E0%B4%BE%E0%B4%A4%E0%B4%AE%E0%B5%81%E0%B4%96%E0%B4%82" title="അനുഷ്ണവാതമുഖം – Malayalam" lang="ml" hreflang="ml" class="interlanguage-link-target">മലയാളം</A></LI><LI class="interlanguage-link interwiki-nl" style="display: none;"><A href="https://nl.wikipedia.org/wiki/Koufront" title="Koufront – Dutch" lang="nl" hreflang="nl" class="interlanguage-link-target">Nederlands</A></LI><LI class="interlanguage-link interwiki-ja"><A href="https://ja.wikipedia.org/wiki/%E5%AF%92%E5%86%B7%E5%89%8D%E7%B7%9A" title="寒冷前線 – Japanese" lang="ja" hreflang="ja" class="interlanguage-link-target">日本語</A></LI><LI class="interlanguage-link interwiki-no" style="display: none;"><A href="https://no.wikipedia.org/wiki/Kaldfront" title="Kaldfront – Norwegian" lang="no" hreflang="no" class="interlanguage-link-target">Norsk</A></LI><LI class="interlanguage-link interwiki-nn" style="display: none;"><A href="https://nn.wikipedia.org/wiki/Kaldfront" title="Kaldfront – Norwegian Nynorsk" lang="nn" hreflang="nn" class="interlanguage-link-target">Norsk nynorsk</A></LI><LI class="interlanguage-link interwiki-pl" style="display: none;"><A href="https://pl.wikipedia.org/wiki/Front_ch%C5%82odny" title="Front chłodny – Polish" lang="pl" hreflang="pl" class="interlanguage-link-target">Polski</A></LI><LI class="interlanguage-link interwiki-pt"><A href="https://pt.wikipedia.org/wiki/Frente_fria" title="Frente fria – Portuguese" lang="pt" hreflang="pt" class="interlanguage-link-target">Português</A></LI><LI class="interlanguage-link interwiki-ru"><A href="https://ru.wikipedia.org/wiki/%D0%A5%D0%BE%D0%BB%D0%BE%D0%B4%D0%BD%D1%8B%D0%B9_%D1%84%D1%80%D0%BE%D0%BD%D1%82" title="Холодный фронт – Russian" lang="ru" hreflang="ru" class="interlanguage-link-target">Русский</A></LI><LI class="interlanguage-link interwiki-simple" style="display: none;"><A href="https://simple.wikipedia.org/wiki/Cold_front" title="Cold front – Simple English" lang="en-simple" hreflang="en-simple" class="interlanguage-link-target">Simple English</A></LI><LI class="interlanguage-link interwiki-sr" style="display: none;"><A href="https://sr.wikipedia.org/wiki/%D0%A5%D0%BB%D0%B0%D0%B4%D0%BD%D0%B8_%D1%84%D1%80%D0%BE%D0%BD%D1%82" title="Хладни фронт – Serbian" lang="sr" hreflang="sr" class="interlanguage-link-target">Српски / srpski</A></LI><LI class="interlanguage-link interwiki-fi" style="display: none;"><A href="https://fi.wikipedia.org/wiki/Kylm%C3%A4_rintama" title="Kylmä rintama – Finnish" lang="fi" hreflang="fi" class="interlanguage-link-target">Suomi</A></LI><LI class="interlanguage-link interwiki-sv" style="display: none;"><A href="https://sv.wikipedia.org/wiki/Kallfront" 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