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<br />1. Observations from the Rosemount Ice Detector, located on top of <br />Squaw Peak, indicated rapid variations in the quantity of liquid water. <br />Several tendencies were evident. First, periods of rE~asonab1e quanti- <br />ties of liquid water generally did not occur in conjunction with pre- <br />cipitation at nearby gage sites. From the limited sample taken, it <br />would appear that periods of sustained larger quantities of liquid water <br />occur prefronta11y or before major upper-level trough passages. These <br />periods are on the order of 45 minutes, and 1 iquid water contents are <br />above 0.2 g/m3. <br /> <br />2. A comparison with previous years' data showed good correlation in <br />types of crystal s and degree of rime. The results of this crystal <br />analysis also showed a tendency toward a heavier riming in prefrontal or <br />pretrough situations. More graupe1 was present during prefrontal <br />situations, and needles and columns were present in postfronta1 condi- <br />tions. Crystal sizes were smaller during prefrontal or pretrough <br />situations. <br /> <br />3. The collection and reduction of PMS 2-DC (Particle Measuring Systems <br />two-dimensional) cloud probe data was performed satisfactorily. The <br />ground-based mobil e p1 atform is generally re1 i ab 1e. F'rocessi ng of all <br />data has yi e1 ded ice crystal si ze d i stribut ions and concentrations for <br />case days. This information is being compared with concurrent black <br />vel vet and microphotographic data to yi e1 d an intercompari son study of <br />the two different collection techniques. <br /> <br />4. The NOAA dual-channel radiometer was operated for 3 months during <br />the limited field season. The system provided both liquid and vapor <br /> <br />1-14 <br /> <br />" <br /> <br />e <br /> <br />e <br /> <br />e <br />