Planned and Inadvertent Weather Modification/Weather Modification Association


Precipitation Processes within Wintertime Clouds Over Central Saudi Arabia

Terry W. Krauss, Weather Modification Inc., Fargo, ND; and R. Bruintjes

On January 7, 2007 a narrow band of strato-cumulus clouds formed north of Riyadh and produced weak radar echoes and rain showers. These continental clouds (cloud base temperature +5 C) were able to produce drizzle drops and rain drops via a coalescence process by the time cloud tops reached the -10 C level, within a relatively shallow convective cloud layer approximately 1800m thick. The WMI Lear Jet collected microphysical in-situ data from first-echoes of approximately 10 dBZ, and an instrumented Cheyenne II collected aerosol data within and below these clouds. Precipitation formed via a graupel process originating from large frozen drops. A conceptual model of wintertime clouds over central Saudi Arabia has been developed.wrf recording  Recorded presentation

Session 4, Updates on Research and Operation Programs: Winter Precipitation Systems Part II
Monday, 21 April 2008, 3:30 PM-5:30 PM, Standley I

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