Artificial Precipitation Potential During Dry Periods in Illinois
- Helmut Weickmann
Published Online: 18 MAR 2013
Copyright 1960 by the American Geophysical Union.
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
- Published Online: 18 MAR 2013
- Published Print: 1 JAN 1960
Book Series Editors:
- Waldo E. Smith
Print ISBN: 9780875900056
Online ISBN: 9781118668931
- 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
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.