Studies of the Rain Parameters of Randomly Seeded Warm and Cold Cumuli.
Final rept. 11 May 70-1 Jul 73,
WEATHER SCIENCE INC NORMAN OKLA
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Oklahoma have yielded the following results. The maritime Florida clouds are modified by encapsulated urea seeding in that the initial surge of large raindrops at the beginning of the non-seeded showers is displaced toward the middle of the life of the seeded showers. Also the slope of the raindrop spectra of the seeded Florida clouds is less steep, implying more large drops, and fewer small drops. Even though the raindrop spectra are significantly different, the difference is not large enough to cause a significant difference in the radar reflectivity-rainfall rate relationship. The continental warm cumuli in Oklahoma were not apparently affected by the hygroscopic seeding. However, the seeding amount was appreciably smaller. Calibration testing of the RR40 Raindrop Spectrometer has resulted in an empirical calibration equation that is considerably different from the original calibration equation that was derived from impulse theory. Author