Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with
dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day.
Low-pressure system A low-pressure area is a region where the atmospheric pressure at sea level is below that of surrounding locations.
High- and low-pressure systems evolve due to interactions of temperature differentials in the atmosphere, temperature differences between the atmosphere and water within oceans
and lakes, the influence of upper-level disturbances, as well as the amount of solar heating or radiationized cooling an area receives.
 High-pressure system High-pressure systems are frequently associated with light winds at the surface and subsidence through the lower portion of the troposphere.
Low-pressure systems form under areas of wind divergence that occur in the upper levels of the troposphere.
 Low-pressure areas can also form due to organized thunderstorm activity over warm water.
Since localized areas of warm air are less dense than their surroundings, this warmer air rises, which lowers atmospheric pressure near that portion of the Earth’s surface.
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.
 Atmospheric lift caused by low-level wind convergence into the surface low brings clouds and potentially precipitation.
A pressure system is a relative peak or lull in the sea level pressure distribution.
 Within the field of atmospheric dynamics, areas of wind divergence aloft occur in two areas: • On the east side of upper troughs, which form half of a Rossby wave within
the Westerlies (a trough with large wavelength, which extends through the troposphere).
 Surface weather maps A surface weather analysis is a type of weather map that depicts positions for high- and low-pressure areas, as well as various types of synoptic
scale systems such as frontal zones.
 Strong but vertically shallow high-pressure systems moving from higher latitudes to lower latitudes in the northern hemisphere are associated with continental arctic
Cs depict cyclonic flow or likely areas of low pressure, while As depict anticyclonic flow or likely positions of high-pressure areas.
 Thermal lows form due to localized heating caused by greater sunshine over deserts and other land masses.
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Photo credit: https://www.flickr.com/photos/candiedwomanire/8181477/’]