Accession Number : AD0766086

Title :   Project Foggy Cloud IV, Phase 1. Evaluation of Warm Fog Dissipation Techniques.

Descriptive Note : Technical publication,

Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CALIF

Personal Author(s) : Hindman,Edward E. , II ; Clark,Richard S. ; St.-Amand,Pierre

Report Date : AUG 1973

Pagination or Media Count : 57

Abstract : 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 nitrate/urea/water solution improved visibility above minimums. The technique using the hygroscopic solution was the most effective. (Author)

Descriptors :   (*FOG, REMOVAL), (*AIRPORTS, VISIBILITY), STRATUS CLOUDS, ARTIFICIAL PRECIPITATION, AMMONIUM COMPOUNDS, NITRATES, UREA, WATER, VORTICES, TEST METHODS, STATISTICAL DATA

Subject Categories : Terminal Flight Facilities
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE