THE OPERATIONAL DISSIPATION OF SUPERCOOLED FOG: PROJECT COLD COWL 1967-1968
AIR WEATHER SERVICE SCOTT AFB IL SCOTT AFB United States
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In the winter of 1967-1968, the Air Weather Service AWS carried out its first operational weather-modification program at Elmendorf AFB. An AWS weather-reconnaissance aircraft WC-130E was used to seed supercooled fog with dry ice. A prescribed flight path was flown a specified distance upwind from the target area, and crushed dry ice disseminated at rates of 12.5 or 25 pounds per mile. It was found that a clearing generally occurred in 30 to 45 minutes. The only real failure occurred in a case that may have been an ice fog in addition, proper positioning of the hole proved a major problem throughout the program. Despite these difficulties, an estimated 200 successful take-offs and landings were made using the artificially produced clearings. Supplemental tests were carried out using airborne liquid CO2 dispensers and silver iodide pyrotechnics.