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<br />radiometer has precluded its placement on top. <br /> <br />After a period of calibration and testing the radiometer <br />will be operated from November 1 to December 12. 1985. <br />It will then be transported to the Sierra Cooperative <br />Pilot Project in California. During the observational <br />period it is expected that all of the liquid water <br />detected will be supercooled because the location of the <br />site. at 3170m m.s.l. is expected to be above the melting <br />level (0 oC isotherm). The presence and magnitude of <br />SLW is of fundamental importance to weather modification <br />because it providl~S the physical condit~on necessary <br />(but not sufficient) for cloud seeding to be effective. <br /> <br />Microwave radiometer measurements have been made at the <br />Island Lake site for more than 5 months already (see <br />Holroyd and Super. 1984. and Super and Holroyd. 1985). <br />These were made in the vertical pointing mode. Such <br />measurements will continue this season. However. <br />scanning will be done to the northwest and southeast <br />during selected storm periods. The antenna can be <br />lowered to about 6'7 degrees from the vertical before the <br />influence of the cliff to the northwest distorts the <br />measurements. By scanning through zenith northwest <br />through southeast. inferences can be made concerning <br />spatial variations in SLW. This is of particular <br />interest for northwest flow where it is strongly <br /> <br />12 <br />