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<br />information on where SLW is likely to be found relative to storm stage and how <br /> <br />SLW is influenced by orography and mesoscale phenomena. The microwave radiometer <br /> <br />has been an important tool in these investigations, and in 1991 the Utah/NOAA <br /> <br />Program used two of these instruments to 1) constantly monitor SLW at the top of <br /> <br /> <br />the Plateau, and 2) measure SLW across and along the Plateau using a mobile <br /> <br />radiometer platform. The DRI work dealt with modifying its radiometer to operate <br />in a mobile mode, and performing mobile data collection experiments during the <br />field program. Specific experiments are described in the Operations Plan. The <br />measurements should add significantly to our knowledge of how SLW is orographi- <br />cally distributed and how efficiently it is depleted by natural precipitation <br />processes. Synoptic, satellite and rawinsonde data will be the primary tools <br />used to evaluate the meteorological factors that control SLW evolution. <br />Data collected by the 1991 project aircraft, which will be incorporated <br /> <br />into the studies of SLW, have been described by Heimbach (1991). Also, data from <br /> <br />the stationary radiometer, which was operated by the United States Bureau of <br /> <br />Reclamation (USBR), will be incorporated into the liquid water analysis. This <br /> <br />report describes the operations and data from the Desert Research Institute dua1- <br /> <br />frequency mobile radiometer, as well as the status of the rawinsonde data that <br /> <br />were collected by UDWR personnel, and data that were archived using the pc-McIDAS <br /> <br />data retrieval system at the Desert Research Institute in Reno, Nevada. <br /> <br />Some preliminary analyses of mobile radiometer data, which were presented <br /> <br />at the 1991 Weather Modification Association Meeting, are included in Appendix <br /> <br />A. In addition, a paper published during 1991 which covers analysis of Doppler <br /> <br />radar data from the 1985 Utah/NOAA field program appears in Appendix B. <br /> <br />2 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />