A low pressure area, or "low", is a region where the atmospheric pressure is lower in relation to the surrounding area. Tropical storms, extratropical cyclones, subpolar cyclones, and subarctic cyclones are called low-pressure cells.
Lows are frequently associated with stronger winds and atmospheric lift. This lift will generally produce cloud cover through 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. Since the clouds reflect sunlight, incoming shortwave solar radiation is less which causes lower temperatures during the day. 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. In Europe (especially in the UK), reoccurring low pressure weather systems are typically known as depressions. These tend to bring wet weather throughout the year.
Surface low pressure systems will tend to be smaller in area and have stronger surface winds than a given high pressure system because of the addition of surface friction to the pressure gradient force, centrifugal force and coriolis effect that drive the circulation
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