Efficiency of Natural Rain

  1. Helmut Weickmann
  1. Raymond Wexler

Published Online: 18 MAR 2013

DOI: 10.1029/GM005p0158

Physics of Precipitation: Proceedings of the Cloud Physics Conference, Woods Hole, Massachusetts, June 3-5, 1959

Physics of Precipitation: Proceedings of the Cloud Physics Conference, Woods Hole, Massachusetts, June 3-5, 1959

How to Cite

Wexler, R. (1960) Efficiency of Natural Rain, in Physics of Precipitation: Proceedings of the Cloud Physics Conference, Woods Hole, Massachusetts, June 3-5, 1959 (ed H. Weickmann), American Geophysical Union, Washington D. C.. doi: 10.1029/GM005p0158

Author Information

  1. Allied Research Associates, Inc., 45 Leon Street, Boston 15, Massachusetts

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1960

Book Series:

  1. Geophysical Monograph Series

Book Series Editors:

  1. Waldo E. Smith

ISBN Information

Print ISBN: 9780875900056

Online ISBN: 9781118668931

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Keywords:

  • Cloud efficiency;
  • Cumulus cloud;
  • Efficiency of rain;
  • Precipitation production;
  • Thunderstorm

Summary

The efficiency of cloud in utilizing the water made available by the updraft for precipitation may be derived from a steady state equation involving storage and horizontal advection. The efficiency is greatest in the middle of widespread rain and least in individual thunderstorms.

The microscale features are evaluated in the initiation of precipitation. Observations indicate that large drop sizes, adequate for growth by the accretion process, are present in many clouds which do not precipitate. The important factor is the product of the mean effective liquid water content and the cloud depth, which has a critical value of about 3 g m−3 km.