Oscillation Teleconnections polar map CDAS NH 500-hPa HT Heights (5 d rm)  13 aug 2015:
Analyzed 500-hPa heights and anomalies. Five-day mean, centered on the date indicated in the title, of 500-hPa heights and anomalies from the NCEP Climate Data Assimilation System (CDAS).  Contour interval for heights is 120 m, anomalies are indicated by shading.   Anomalies are departures from the 1981-2010 daily base period means. (Text after NOAA, <a rel="nofollow" class="external text" href="http://www.cpc.ncep.noaa.gov/products/intraseasonal/z500_nh_anim.shtml">Northern Hemisphere 500 hecto Pascals Height Anomalies Animation</a>)<br>Illustrates extended tropical Headley cells, very westward moved Azores high, extreme blocking and high-pressure ridge from Europe to the North pole: Ending of third European summer heat wave 2015; up to 45°C in Egypt.
NOAA  / National Weather Service / National Centers for Environmental Prediction / Climate Prediction Center Internet Team<br>File: <a href="//commons.wikimedia.org/wiki/User:W!B:" title="User:W!B:">W!B:</a> (<a href="//commons.wikimedia.org/wiki/User_talk:W!B:" title="User talk:W!B:"><span class="signature-talk">talk</span></a>) (extracted from animation, rotated)
NOAA NCEP CPC &gt; Climate &amp; Weather Linkage &gt; Teleconnections &gt; North Atlantic Oscillation <a rel="nofollow" class="external free" href="http://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/nao.shtml">http://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/nao.shtml</a>