Project Foggy Cloud IV, Phase 1. Evaluation of Warm Fog Dissipation Techniques.
NAVAL WEAPONS CENTER CHINA LAKE CALIF
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Project Foggy Cloud IV, Phase 1, is part of a continuing series of experiments concerning the modification and dispersal of warm fog and stratus clouds. Tests were conducted at the Arcata-Eureka airport, Humboldt County, Calif., from 26 July to 7 October 1971, using a fixed-wing aircraft as a delivery vehicle. The seeding agents were water and a solution of ammonium nitrate, urea, and water developed during Project Foggy Cloud 1. The effects of the wing-tip vortices from the aircraft were investigated. One of the three definitive tests with wing-tip vortices improved the visibility above field minimums. One of the four definitive tests with water improved visibility above minimums. Three of the six definitive tests with the ammonium nitrateureawater solution improved visibility above minimums. The technique using the hygroscopic solution was the most effective. Author
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