Precipitation-Maintained Downdrafts

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Abstract
A first quantitative estimate of the maintenance of a downdraft by the evaporation of precipitation is made for the steady state of a severe convective storm. Results are presented for a sufficiently wide range of drop size, liquid water content and relative humidity for the trends to be determined. It is confirmed that cooling by evaporation is most efficient if the drop radii are small, and that the most severe downdrafts are produced in air from the upper troposphere which is notably dry.

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