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I I I I I I I I I I I I I I I I I I I during prior Utah/NOAA field programs. Finally, data from two NASA research aircraft flights were processed and analyzed, and a technique for distinguishing between ice and water cloud regions, using downward-looking near-infrared spectrometer measurements, is described. The structure of this Final Report is as follows. Section 2 describes instrumentation, calibration procedures, data reduction and data processing. Section 3 gives a description of each Storm Period that occurred during the 1991 field program, including the temporal distribution of SL W, the synoptic features that affected the research area, the temporal evolution of various meteorological parameters at the high altitude Utah/NOAA field site, and examples of radar and satellite data for each Storm Period. Section 4 provides the results of the comphrehensive analysis of SLW over the Wasatch Plateau, including frequency distributions, SLW fluxes and precipitation totals, stratification of SL W by synoptic features and meteorological parameters, stratification of SL W depth by location on the Plateau, and discussion of many implications based on the individual fmdings. Section 5 provides an example of the NASA ER-2 A VIRIS data and compares it with NOAA King Air data and ground-based remote sensing data. Section 6 summarizes the main findings and offers conclusions and recommendations based on these fmdings. Three Appendicies provide data plots which were too numerous to include in the main body of this report. Appendix A contains time versus height prof1les of sounding data for selected Storm Periods. Appendix B is the reproduction of a paper presented at the 1992 Weather Modification Symposium in Atlanta, Georgia, which describes the DR! mobile radiometer and presents data from individual mobile experiments. Finally, Appendix C provides plots of all mobile radiometer experiments from the 1991 field program. 1-3