. Compendium of meteorology. Meteorology. ARTIFICIAL CLOUD-MODIFICATION AND PRECIPITATION 241 be at 24,000 ft where the temperature was — 25C was seeded with dry ice at the rate of five pounds per mile. This cloud contained only supercooled water at the 20,000-ft seeding altitude and no radar echo was ob- served from it prior to the seeding. Within 10 min after the seeding, a small rain echo was observed from the cloud and light virga was observed by the low obser- vation aircraft. It was estimated that within about one-half hour after the seeding this cloud had dissi- pated approximately 75 p
. Compendium of meteorology. Meteorology. ARTIFICIAL CLOUD-MODIFICATION AND PRECIPITATION 241 be at 24,000 ft where the temperature was — 25C was seeded with dry ice at the rate of five pounds per mile. This cloud contained only supercooled water at the 20,000-ft seeding altitude and no radar echo was ob- served from it prior to the seeding. Within 10 min after the seeding, a small rain echo was observed from the cloud and light virga was observed by the low obser- vation aircraft. It was estimated that within about one-half hour after the seeding this cloud had dissi- pated approximately 75 per cent. Figures 7 and 8 are. Fig. 7.—Third seeding, June 7, 1949 (before seeding). Altitude, 20,000 ft; time, 1430; azimuth, 360°. pictures of the cloud immediately before and 14 min after seeding. They show its rapid conversion into ice Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Meteorological Society. Committee on the Compendium of Meteorology; Malone, Thomas F. Boston : American Meteorological Society
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