meteors, which are atmospheric water phenomena) is any product of the condensation of atmospheric water vapor that falls under gravity.[1] The main forms of pr
ecipitation include drizzle, rain, sleet, snow, gra
upel and hail. It occurs when a local por
tion of the atmosphere becomes saturated with water vapour and the water condenses.[2
] Two processes, poss
ibly acting together, can lead to air becoming saturated: cooling the air or adding water vapour to the air. Generally, precipitation will fall to the surface; an exception is Virga which evaporates b
fore reaching the surf
. Precipitation forms as smaller drople
coalesce via collision with other r
ain drops or ice crystals within a cloud. Rain drops range in size from oblate, pancake-like shapes for larger drops, to small spheres for smaller drops. Unlike raindrops, snowflakes grow in a variety of different shapes and patterns, determined by the temperature and humidity characteristics of the air the snowflake moves th
rough on its way to the gro
und. While snow and ice pellets require temperatures close to the ground to be ne
ar or bel
ow freezing, hail can occur during much warmer temperature regimes due to the p
rocess of its formation.
Moisture overriding associated with weather fronts is an overall major method of p
recipitation production. If en
ugh moisture and upward motion is present, precipitation fa
lls from convective clouds such as cumulonimbus and ca
n organize into narrow rainbands. Where relatively warm water bodies are
present, for example due to
water evaporation from lakes, lake-effect snowfall becomes a concern downwind of the warm lakes within the cold cyclonic flow around the backside of extratropical cyclones. Lake-effe
ct snowf
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