<P> Highs are frequently associated with light winds at the surface and subsidence through the lower portion of the troposphere . In general , subsidence will dry out an air mass by adiabatic , or compressional , heating . Thus , high pressure typically brings clear skies . During the day , since no clouds are present to reflect sunlight , there is more incoming shortwave solar radiation and temperatures rise . At night , the absence of clouds means that outgoing longwave radiation ( i.e. heat energy from the surface ) is not absorbed , giving cooler diurnal low temperatures in all seasons . When surface winds become light , the subsidence produced directly under a high - pressure system can lead to a buildup of particulates in urban areas under the ridge , leading to widespread haze . If the low level relative humidity rises towards 100 percent overnight , fog can form . </P>
<P> Highs are frequently associated with light winds at the surface and subsidence through the lower portion of the troposphere . In general , subsidence will dry out an air mass by adiabatic , or compressional , heating . Thus , high pressure typically brings clear skies . During the day , since no clouds are present to reflect sunlight , there is more incoming shortwave solar radiation and temperatures rise . At night , the absence of clouds means that outgoing longwave radiation ( i.e. heat energy from the surface ) is not absorbed , giving cooler diurnal low temperatures in all seasons . When surface winds become light , the subsidence produced directly under a high - pressure system can lead to a buildup of particulates in urban areas under the ridge , leading to widespread haze . If the low level relative humidity rises towards 100 percent overnight , fog can form . </P>
what conditions are typical of high pressure cells in the northern hemisphere
what conditions are typical of high pressure cells in the northern hemisphere
light winds at the surface clear skies temperatures rise diurnal low temperatures in all seasons widespread haze low level relative humidity
light winds at the surface clear skies temperatures rise diurnal low temperatures in all seasons widespread haze low level relative humidity