met1017 - formation of rain requires a lot of warmth within...

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Meteorology 17/10/2006 09:59:00 Stability [continued] Dry Air: ELR > 10 degrees C/km = unstable  [constantly rising/constantly accelerating] ELR < 10 deg. C = stable  [discontinue rising at a certain point] ELR = 10 deg. C: neutral  [newton’s second law: net force=0; moves at  constant speed] Moist Air: ELR > 6.5 = unstable ELR < 6.5 = stable ELR = 6.5: neutral Combination: ELR > 10 = absolutely unstable ELR < 6.5 = absolutely stable 10 > ELR > 6.5 = conditionally stable Temperature inversions—when temperature increases with height [very stable] cloud development and precipitation condensation nuclei—tiny particles on which extra vapor condenses [any sort of  matter] air saturates to 100%; further cooling pushes relative humidity above 100% and  condenses extra vapors.  Cloud droplets form on particles in atmosphere, and  eventually form raindrops.
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Unformatted text preview: formation of rain requires a lot of warmth within a cloud. Mechanisms to create precipitation Warm Cloud Process: equilibrium created when cloud forms; as cloud rises, the cloud cools and extra vapor goes through a second condensation; this extra condensation is constantly absorbed by droplets. [extra vapor is always present, and as the air rises in the cloud, droplets will constantly become bigger.] the biggest droplets are at the top of a cloud, and as they fall, they collect other droplets and increase in size. [in other words, there are two cycles of increase in size: water vapor and collision.] o does not happen in winter o happens most often in the tropics, where the air is always warm. also happens here, in summer. 17/10/2006 09:59:00 17/10/2006 09:59:00...
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met1017 - formation of rain requires a lot of warmth within...

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