Evaporation Cooling


Evaporation cooling occurs when precipitation falls through a dry layer of air. Since evaporation is a cooling process, the temperature of the dry layer falls a few degrees. This is especially common during late-winter storms when the surface temperature starts out in the 40s but falls to freezing and sometimes hovers there after the onset of precipitation. If the moisture stream is rich enough then it might rise over the warm air and continue to produce a heavy moisture dump in the pockets of that area.


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