Accession Number : AD0748798

Title :   Probability of Encountering Thunderstorms at 50,000 and 60,000 Feet for Selected Routes Over the United States.

Descriptive Note : Environmental research papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Grantham,Donald D. ; Kantor,Arthur J.

Report Date : 14 JUL 1972

Pagination or Media Count : 16

Abstract : The probability of encountering cumulonimbi has been determined for the worst route, month and time; that is, over the southern U.S. during July between 1600 and 1800 LST. Three transcontinental routes are examined: Miami to Los Angeles, Miami to San Francisco, and Washington D. C. to Los Angeles, distances measuring 2000, 2250, and 2030 nmi, respectively. Preliminary results indicated one encounter (within a 10-mile-wide flight path) for every 4 flights along the Miami-West Coast routes at 50,000 ft, and one for every 57 flights along the same routes at 60,000 ft. Clouds are assumed to be dome-shaped with base diameters ranging from 6.7 to 15 nmi at 50,000 ft and 6.7 to 10.5 nmi at 60,000 ft. (Author)

Descriptors :   (*WEATHER FORECASTING, AVIATION SAFETY), FLIGHT PATHS, SUPERSONIC AIRCRAFT, THUNDERSTORMS, PROBABILITY

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE