ATM OCN 100 Study Guide - Final Guide: Fluid Parcel, Ice Crystals, Stratus Cloud

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4 ways clouds form surface heating and free convection, topography, widespread ascent due to the flowing together (convergence) of surface air, uplift along weather front. Two situations: clouds with small same sized droplets and clouds with different sized droplets. 1. in a warm cloud composed only of small cloud droplets of uniform size, the droplets are less likely to collide as they fall very slowly at about the same speed. The droplets that do collide, frequently do not coalesce because of the strong surface tension that holds together each tiny droplet: in a cloud composed of different size droplets, larger droplets fall faster than smaller droplets. Although some tiny droplets are swept aside, some collect on the larger droplet"s forward edge, while others (captured by the larger) coalesce on the droplet"s backside moist adiabatic rate saturated parcel with a rate of ~6 degrees celsius.

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