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<br />1 <br /> <br />, <br />. <br /> <br />003352 <br /> <br />What Data is Used for Planning and Conducting the Cloud Seeding Operations? <br /> <br />The primary source of data is that available from the National Weather <br /> <br /> <br />Service. This is provided on a continuous basis to the cloud seeding <br /> <br /> <br />center of Western Weather, Inc. in Durango (similar data is available to <br /> <br /> <br />the weather modification coordinator through the CSU Atmospheric Science <br /> <br />Department). Supplemental measurement8 of upper air conditions are provided <br /> <br />to the weather modification companies as part of the state weather modifica- <br /> <br />tion program. The sites for these observations are at Craig and Durango <br /> <br /> <br />and they supplement National Weather Service sites (only two) at Grand <br /> <br /> <br />Junction and Denver. The supplemental sites can take upper soundings <br /> <br /> <br />as required for the program rather than just at the 5 am and the 5 pm <br /> <br /> <br />observations of the National Weather Service. The analysis of the <br /> <br /> <br />program's upper air soundings are made through a link with the computer <br /> <br />processing facilities of the Bureau of Reclamation in Denver. <br /> <br />What is being Done to Monitor the Seeding Materials After Thev are Released? <br /> <br /> <br />Monitoring of artifical seeding materials released is being carried <br /> <br /> <br />out on a modest scale by the Atmospheric Science Department of CSU. This <br /> <br /> <br />includes measurements designed to detect artificial seeding materials <br /> <br /> <br />coming into the state from Utah as well as those released by the Colorado <br /> <br /> <br />program. Mountain slope measurements are being made at three sites with <br /> <br /> <br />ice nculei counters. These can detect natural ice nuclei concentrations <br /> <br />and the much higher values associated.with seeding materials. Measurements <br /> <br />were made at a fourth site with a portable system during February in <br /> <br />connection with other Colorado State University field research. Additionally, <br /> <br />aircraft observations of ice nuclei have been made both as. part of the <br /> <br />7 <br />