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  • Author or Editor: Larry O. Pochop x
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Dennis S. Walts and Larry O. Pochop

Abstract

A method is presented for increasing the number of points for which a local forecast office may obtain objective maximum and minimum temperature forecasts twice daily. The method is simple enough that it may be both developed locally and used operationally in daily forecasts with a minimum amount of time involved. The additional objective temperature forecasts rely heavily on objective temperature forecasts produced twice daily at the National Meteorological Center, but extrapolates these forecast through statistical methods to secondary points. Therefore, they remain strongly linked to the operational numerical models. Examples of “predictor” curves are also presented.

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Larry O. Pochop, Milton D. Shanklin, and David A. Horner

Abstract

Effects of sky cover variations on daylight total hemispheric radiation were determined from measurements made at Columbia, Mo. Total hemispheric radiation was measured by a Beckman and Whitley radiometer, solar radiation by an Eppley pyrheliometer, and sky cover by photoelectric scanning of whole-sky negatives. Regressions were calculated relating values of incoming radiation during daylight hours to sky cover. Daily total hemispheric radiation was expressed using values of sky cover and the amount of radiation received at the top of the atmosphere. Average hourly hemispheric and downward solar radiation received during daylight hours was expressed as functions of the second power of sky cover, except for large solar zenith angles. Decreases in total hemispheric radiation with increasing sky cover were attributed mainly to decreases in values of the incoming solar radiation component.

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