Accession Number : AD0784791

Title :   The Variability of Visibility in the Hanscom Mesonetwork: A Preliminary Assessment.

Descriptive Note : Environmental research papers,

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

Personal Author(s) : Chisholm,Donald A. ; Kruse,Horst

Report Date : 13 JUN 1974

Pagination or Media Count : 37

Abstract : A preliminary assessment of the temporal and spatial variability of visibility in the Hanscom mesonetwork has been conducted with approximately eight months (September 1972-April 1973) of data. The variability of measurements obtained from forward scatter visibility meters (FSM) was found to be greatest in radiation fog episodes and least in precipitation in both time and space. Time variability was found not to be greatly affected by local topography and to be less at 45 m than at 4 m above ground level. An examination of interpolation error, through the method of optimum interpolation, revealed an improvement in the error of about 20 percent when the distance between observation points is halved in advective situations and about 10 percent in radiation fog episodes. Relating the interpolation errors to the natural variability of visibility prescribed the prediction potential of the Hanscom mesonetwork for short range prediction experiments. (Author)

Descriptors :   *Visibility, *Runways, *Weather forecasting, Airports, Meteorological instruments, Automation, Networks, Meteorological radar, Fog, Statistical analysis, Snow, Rain, Errors, Military facilities, Massachusetts

Subject Categories : Terminal Flight Facilities
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE