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<br />- <br /> <br />e <br /> <br />e <br /> <br />.. <br /> <br />quantities along a beam and could scan in both PPI and RHI modes. The <br />device provided believable v~ues of vapor and liquid, especially when <br />no precipitation occurred directly at the field site. There was some <br />evidence that val ues increased prior to the onset of rainfall from storm <br />systems. Several studies of cellular convection near the site were made <br />with the radiometer. By scanning back and forth through the cell, it is <br />possible to construct a sequence of the buildup and depletion of liquid <br />and vapor. <br /> <br />The primary objective during the 1981-82 field season was a shakedown of <br />the operational procedures required to cal~ry out a randomized experiment on <br />cellular convection (SCPP-1). Other tasks included further investigations <br />of rainbands and the orographic cloud and the development of appropriate <br />seeding strategies. The season contributE~d some of the heaviest quantities <br />of rain and snow ever observed in this portion of the Sierra Nevada. <br />Precipitation totals in excess of 254 m (100 in) were not uncommon. About <br />30 percent of potential seeding opportunities were lost due to suspensions. <br />In any case, several results are worthy of comment. They are as follows: <br /> <br />1. In general, the day-to-day operational procedures for c arryi ng out <br />the SCPP-1 experiment are in good order. Some 10 experiments were <br />forecast, declared and worked during the intensive field season. <br />Seeding was conducted along 37 km (20 nmi) legs by the UND aircraft, <br />and the Wyoming aircraft flew certain selected cells for detailed <br />microphysical observations. <br /> <br />2. There was difficulty in getting FAA (Federal Aviation Administration) <br />approval in several cases for flying the rathe!r compl icated patterns <br /> <br />1-15 <br />