Laserfiche WebLink
<br />sophisticated cloud physics aircraft similar to the King Air <br />provided by the University of Wyoming under contract with the <br />Service. <br /> <br />. <br /> <br />5. Radar Data. A spatial and temporal depiction of storms as they <br />evolve over the area is necessary to develop a climatology and an <br />understanding of storm types in the area. A real-time computer- <br />driven graphical display of the radar data will be overload and <br />displayed with all compatible data. Horizontal and vertical <br />windfields within the region of precipitation-sized particles will <br />be measured with a tri-Doppler radar array. <br /> <br />Opportunity Recognition. Improved recognition of the opportunity <br />to increase precipitation in winter orographic clouds is a key <br />factor in the transition from research to operational precipitation <br />management in the Colorado River Basin. It involves the identifica- <br />tion of those cloud and atmospheric conditions essential to <br />precipitation formation and any deficiencies in natural conditions <br />that might be present. These conditions must be forecast far enough <br />in advance or recognized rapidly enough during a storm to permit <br />efficient treatment of the system by available observation techniques. <br /> <br />Seeding opportunities must have the following attributes to be <br />operationally viable: <br /> <br />1. They must be easy to recognize and distinquish from unsuitable <br />events. <br /> <br />2. They must be recognizable soon enough to allow treatment at the <br />proper time. <br /> <br />3. They must have the potential to last long enough to provide <br />useful additional precipitation after treatment. <br /> <br />4. Their frequency of occurrence and their potential precipitation <br />increases over the season must be large enough for the value of the <br />additional water to exceed the cost of the operation. <br /> <br />. <br /> <br />Prior to the CRBPP (Colorado River Basin Pilot Project), weather <br />modification research experiments treated every storm condition <br />and later stratified the data to determine those conditions most <br />suitable for precipitation enhancement. The CRBPP was the first <br />randomized experiment to attempt to recognize the seedable <br />opportunity by warm cloud tops up to 24 hours in advance. Two <br />indices of opportunity were used: One was range of 500-mbar <br />temperatures; the other was a range of rawinsonde-derived cloud-top <br />temperatures. Although anticipated to be a relatively simple <br /> <br />V-5 <br />