ANALYSIS OF FLAGSTAFF DATA.
Quarterly rept. no. 2, 1 Feb-30 Apr 65,
METEOROLOGY RESEARCH INC ALTADENA CALIF
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This report continues the analysis of data obtained in the summers of 1962 and 1963 on the Flagstaff field program. The total program consists of four subjects 1 Precipitation mechanisms and droplet coalescence 2 case studies of seeded clouds 3 cloud and storm development and 4 electrification. This report contains the final results of item 1 and a final portion of item 3, each given here as a separate portion with its own abstract. 1 The evolution of droplet distributions with height is given. Droplet concentrations were large, and some correlation of concentration versus upcurrent strength at cloud base was observed. Liquid drops grew in the cells by coalescence, perhaps starting from giant nuclei ofte about 20 per liter, but zero in one case. Graupel from freezing and riming of these drops was regularly encountered at -5 and -6C, mostly in the cloud outside the convective cores. 3 In southwest flow conditions, morning convective clouds form near the peaks primarily over the sunlit eastern slopes. Convective storm formation areas were a downwind of the peaks the convective wake, b over the peaks elevated heat source of the peaks, c over a low ridge southwest of Flagstaff ridge heating, and d over the desert northwest of the peaks isolated desert heat source. Author