Difference between revisions of "Warm rain process"

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<div class="definition"><div class="short_definition">In [[cloud physics]], the process producing [[precipitation]] through collision between  liquid [[particles]] ([[cloud droplets]], [[drizzle drops]], and [[raindrops]]).</div><br/> <div class="paragraph">The warm rain process includes growth by [[collision&ndash;coalescence]] and limitations to growth  by [[drop breakup]]. Precipitation produced by the warm rain process occurs in clouds having  sufficient liquid water, [[updraft]], and lifetime to sustain collision&ndash;coalescence growth to drizzle drop  or raindrop sizes. Since warm base (&gt;10&deg;C) convective clouds of about 2 km depth typically have  these features, the warm rain process is found to be active in both shallow and deep [[convection]]  in the [[Tropics]] and midlatitudes. The major role of the warm rain process in thunderstorms is to  [[transfer]] condensed water, in the form of cloud droplets, to [[precipitable water]], in the the form  of drizzle droplets and raindrops, by the collision&ndash;coalescence process. The warm rain process can  also produce supercooled raindrops that [[freeze]] and become [[graupel]], necessary for the rapid  [[glaciation]] of convective tops by production of secondary [[ice crystals]]. This has been called the  [[coalescence]] freezing mechanism. <br/>''See'' [[Hallett&ndash;Mossop process]].</div><br/> </div>
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<div class="definition"><div class="short_definition">In [[cloud physics]], the process producing [[precipitation]] through collision between  liquid [[particles]] ([[cloud droplets]], [[drizzle drops]], and [[raindrops]]).</div><br/> <div class="paragraph">The warm rain process includes growth by [[collision&ndash;coalescence]] and limitations to growth  by [[drop breakup]]. Precipitation produced by the warm rain process occurs in clouds having  sufficient liquid water, [[updraft]], and lifetime to sustain collision&ndash;coalescence growth to drizzle drop  or raindrop sizes. Since warm base (&gt;10&#x000b0;C) convective clouds of about 2 km depth typically have  these features, the warm rain process is found to be active in both shallow and deep [[convection]]  in the [[Tropics]] and midlatitudes. The major role of the warm rain process in thunderstorms is to  [[transfer]] condensed water, in the form of cloud droplets, to [[precipitable water]], in the the form  of drizzle droplets and raindrops, by the collision&ndash;coalescence process. The warm rain process can  also produce supercooled raindrops that [[freeze]] and become [[graupel]], necessary for the rapid  [[glaciation]] of convective tops by production of secondary [[ice crystals]]. This has been called the  [[coalescence]] freezing mechanism. <br/>''See'' [[Hallett&ndash;Mossop process]].</div><br/> </div>
 
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Revision as of 16:26, 20 February 2012



warm rain process

In cloud physics, the process producing precipitation through collision between liquid particles (cloud droplets, drizzle drops, and raindrops).

The warm rain process includes growth by collision–coalescence and limitations to growth by drop breakup. Precipitation produced by the warm rain process occurs in clouds having sufficient liquid water, updraft, and lifetime to sustain collision–coalescence growth to drizzle drop or raindrop sizes. Since warm base (>10°C) convective clouds of about 2 km depth typically have these features, the warm rain process is found to be active in both shallow and deep convection in the Tropics and midlatitudes. The major role of the warm rain process in thunderstorms is to transfer condensed water, in the form of cloud droplets, to precipitable water, in the the form of drizzle droplets and raindrops, by the collision–coalescence process. The warm rain process can also produce supercooled raindrops that freeze and become graupel, necessary for the rapid glaciation of convective tops by production of secondary ice crystals. This has been called the coalescence freezing mechanism.
See Hallett–Mossop process.