low pressure

not stressful; not a great deal of pressure

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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Noun
1. an air mass of lower pressure; often brings precipitation; "a low moved in over night bringing sleet and snow"
(synonym) low, depression
(hypernym) air mass
(part-holonym) cyclone

Adjective
1. not forceful; "a low-pressure salesman"; "a low-pressure campaign"
(similar) unaggressive, nonaggressive

(a.)
Having, employing, or exerting, a low degree of pressure.
  

low-pressure /'lou'preʃə/
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