A low pressure area, or a low for short, is a region where the
atmospheric pressure is lowest with relation to the surrounding area.
Tropical storms,
extratropical cyclones, subpolar cyclones, and subarctic cyclones are called low-pressure cells in some English-speaking communities.Lows are frequently associated with stronger
winds and
atmospheric lift. This lift will generally produce
cloud cover, due to
adiabatic cooling, once the air becomes saturated as it rises. Thus, low pressure typically brings cloudy or
overcast skies, which may minimize diurnal temperature extremes in both
summer and
winter, due to the significant cloud cover. This is due to less incoming
shortwave solar radiation and lower
temperatures during the day, since the clouds reflect
sunlight. At night, the absorptive effect of clouds on outgoing
longwave radiation, such as heat energy from the surface, allows for warmer diurnal low temperatures in all seasons.
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