GEOG 1101 Lecture Notes - Lecture 11: Cloud Condensation Nuclei, Nimbostratus Cloud, Hygroscopy
7 Feb 2017
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* the basic process is water vapor changing to liquid water droplets (cloud droplets) by condensation, and these droplets coalescing with other droplets to form raindrops. * need larger cloud droplets from large" condensation nuclei or hygroscopic nuclei since small droplets don"t coalesce & collide by themselves very well. * a combination of bergeron & collision-coalescence processes is often seen in thunderstorms to form precipitation. Even in summer, ice crystals will form in the top of the t-storms and then melt as they fall forming raindrops. ** fall or terminal velocities of cloud droplets and raindrops: Remember that all precipitation comes from either nimbostratus or cumulonimbus clouds. Rain droplets average between . 5 mm to 5 mm in size and are a liquid form of precipitation. Snow is a solid form of precipitation and average 1 - 2 mm in size. Know the conversion of snow to rain for the purpose of precipitation totals.
