Accession Number : AD0488494

Title :   ANALYSIS AND PREDICTION OF VISIBILITY AT SEA.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Schramm, William George

Report Date : MAY 1966

Pagination or Media Count : 54

Abstract : This paper is concerned with the problem of visibility at sea and fog over the sea. Restrictions to visibility in general are discussed and suspended moisture is related to low visibilities at sea. Fleet Numerical Weather Facility at Monterey produces a field of the difference between the vapor pressures of the sea and air. This field is used as a humidity index to determine the moisture in the air and is related to visibility. A total of 1100 data points from the North Atlantic were analyzed and an attempt was made to produce a linear regression equation. The regression equation proved to be most inaccurate in the area of low visibilities. A scattergram of visibility as a function of air temperature and the vapor pressure difference revealed a significant relationship. Using this relationship it is possible to forecast visibility and fog probability.

Descriptors :   (*VISIBILITY, OCEANS), (*WEATHER FORECASTING, FOG), ATMOSPHERIC TEMPERATURE, WIND, MOISTURE, ATLANTIC OCEAN, AIR, NUMERICAL ANALYSIS, GRAPHICS, COMPUTER PROGRAMMING, VAPOR PRESSURE, STRATUS CLOUDS, DEW POINT, HUMIDITY, PRESSURE, PROBABILITY, MATHEMATICAL PREDICTION, ATMOSPHERIC PRECIPITATION, MAPS, BACKGROUND.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE