Accession Number : AD0658889

Title :   AN INVESTIGATION OF LOW VISIBILITY DURING JANUARY AND FEBRUARY AT SUFFOLK COUNTY AIR FORCE BASE,

Corporate Author : WEATHER SQUADRON (12) SUFFOLK COUNTY AFB N Y DETACHMENT 9

Personal Author(s) : Cohen,Sydney M.

Report Date : 12 JUN 1967

Pagination or Media Count : 22

Abstract : The investigation of conditions leading to low visibility at Suffolk County AFB (FOK) during January and February was approached in four ways. This paper defines deterioration as a decrease in visibility to four miles or less. Likewise, low visibility is a visibility of four miles or less. The first approach was accomplished by graphically plotting the dew point depression as a function of cloud cover at sunset. The only conclusion was that when the depression is 8F or less, regardless of cloud cover, the probability for low visibility in the next several hours is 80.7%. The second approach involved an analysis of cloud cover as a function of dew point depression for both six and three hours prior to the recorded low visibility. For the same times an analysis was also made of wind direction vs. dew point depressions. The final approach was a study of the relationship between low visibility and the preceeding local pressure changes. (Author)

Descriptors :   (*VISIBILITY, AIRPORTS), NEW YORK, DEW POINT, WIND, CLOUDS, BAROMETRIC PRESSURE, GRAPHICS, WEATHER FORECASTING

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE