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<br />.. <br /> <br />e <br /> <br />- <br /> <br />e <br /> <br />3. The answer to the question of how to forecast the variety of <br />PET's in near-real time and infer seeding potential is becoming <br />clearer. Results from 1979-80 showed that the forecaster can <br />anticipate specific cloud types with the help of sounding data and, <br />part icu1 ar1 y, satell ite information. An a1 yses by ETI (E1 ectronic <br />Techniques, Inc.) and others indicate that PET's can have unique <br />sounding stabilities and a vertical wind shear sturucture. <br /> <br />4. A new tool was used during the 1979-80 field season. NOAA <br />(National Oceanic and Atmospheric Admiinistration) provided a sing1e- <br />wavelength radiometer to measure liquid water along a single beam <br />between the receiver and a geostat ionclry s atell ite. Experienc:e thus <br />far indicates that the radiometer is. a potentially excellent device <br />for detecting liquid water in Sierra storms. Indeed, data from the <br />radiometer provided the impetus for one experimental study during the <br />1979-80 field season. <br /> <br />5. Ground microphysics observations were performed from both a <br />fixed site and in transects across the barrier. The results from <br />1979-80 indicated some potential for observing seeding effects if <br />proper targeting is achieved. However, the changes occurred over <br />such a short period that increased data resolution is necessary. <br /> <br />Data anal ys is of results from the 1979-80 wi nter reveal ed average <br />concentrations of only three ice crystil1s/L. This fairly low concen- <br />tration is encouraging from the standpoint of enhancement potential. <br />In addition, many of the sampled crystal s contained rime ice. The <br />ice is evidence of available liquid water in the clouds. <br /> <br />1-11 <br />