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In atmospheric science, a cold pool (CP) is a cold pocket of dense air that forms when rain
In atmospheric science, a cold pool (CP) is a cold pocket of dense air that forms when rain evaporate
Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase. High concentration of the evaporating substance in the surrounding gas significantly slows down evaporation, such as when humid ...
s during intense precipitation
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds. The main forms of precipitation include drizzle, rain, sleet, snow, ice pellets, graupel and hai ...
e.g. underneath a thunderstorm
A thunderstorm, also known as an electrical storm or a lightning storm, is a storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere, known as thunder. Relatively weak thunderstorms are somet ...
cloud. Typically, CPs spread at 10 m/s and last 2–3 hours.
Characteristics
CPs spread radially away from the rain event along the surface as a moving gust front. When the gust front passes, CPs cause an increase in wind speed and a sudden drop in specifichumidity
Humidity is the concentration of water vapor present in the air. Water vapor, the gaseous state of water, is generally invisible to the human eye. Humidity indicates the likelihood for precipitation, dew, or fog to be present.
Humidity dep ...
and in air temperature
Atmospheric temperature is a measure of temperature at different levels of the Earth's atmosphere. It is governed by many factors, including incoming solar radiation, humidity and altitude. When discussing surface air temperature, the annual at ...
. In large- eddy simulations, they reach 10 km in radius, whereas, in reality, they can become as large as 50–100 km in radius. Collisions between multiple CPs can trigger the formation of a new thunderstorm event, and thereby form a new CP.
See also
*Cold drop
A cold drop (from the Spanish "gota fría") is a term used in Spain that has commonly come to refer to any high impact rainfall events occurring in the autumn along the Spanish Mediterranean coast. In Europe, cold drops belong to the characterist ...
References
{{Reflist Severe weather and convection fr:Goutte froide#Goutte méso