Computation of Visual Range in Fog and Low Clouds

Don R. Dickson University of Utah and Intermountain Weather, Inc., Salt Lake City, Utah

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J. Vern Hales University of Utah and Intermountain Weather, Inc., Salt Lake City, Utah

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Abstract

Visual ranges were computed for various values of extinction coefficient, for five sets of conditions appropriate to fog and low clouds. The computations involve basic theories of visual range as developed by Allard (1876) and Koschmieder (1924). The four values of the threshold of illumination (Et) which Haig and Morton determined were used in the Allard theory computations.

Abstract

Visual ranges were computed for various values of extinction coefficient, for five sets of conditions appropriate to fog and low clouds. The computations involve basic theories of visual range as developed by Allard (1876) and Koschmieder (1924). The four values of the threshold of illumination (Et) which Haig and Morton determined were used in the Allard theory computations.

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