Artificial Precipitation Potential During Dry Periods in Illinois

  1. Helmut Weickmann
  1. Richard G. Semonin

Published Online: 18 MAR 2013

DOI: 10.1029/GM005p0424

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

Semonin, R. G. (1960) Artificial Precipitation Potential During Dry Periods in Illinois, 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/GM005p0424

Author Information

  1. Illinois State Water Survey, Urbana, Illinois

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 data;
  • Cloud seeding;
  • Dry period, Illinois;
  • Illinois State Water Survey;
  • President's Advisory Committee on Weather Control;
  • Showalter stability index;
  • Upper-air flow and surface temperature

Summary

The macroscale meteorological conditions of the atmosphere were studied during 31 dry periods which occurred in 1953–1955. A dry period is defined as at least five consecutive days with less than ten per cent of the normal precipitation over an area in east central Illinois.

The parameters investigated, measured at Rantoul, Illinois, were: precipitable water, low cloudiness, and the Showalter stability index. The upper-air flow, surface temperature, and general synoptic conditions were considered in individual case studies.

The results indicate that although there is near normal water vapor in the atmosphere during the majority of the dry periods, there was a deficit of low clouds. It is concluded from the study that in addition to present cloud-seeding techniques, much research is needed to determine means of initiating clouds, since, during dry periods in Illinois, large quantities of clouds desired for seeding are not available.