Abstract: An analysis of daily observations of sunshine taken in the central and northeastern United States during the spring and summer indicates the presence of a lunar synodical period. Less than average sunshine is observed ...

Abstract: Predictions of sea-level pressure changes for periods of 1, 2, 3, 6, 9 and 11 hr were prepared employing analogues and many different linear regression equations. The equations were derived on a sample of 445 days and ...

Abstract: Five methods for using standard cloud observations to estimate the probability of a clear line-of-sight, or sunshine, through the atmosphere are described and compared. The root-mean-square errors of the probability estimates ...

Abstract: No abstract available.

Abstract: Geopotential heights of the 850-mb surface at 499 grid points over one-half of the Northern Hemisphere, extending from 10°E westward to 170°W, were correlated with daily precipitation observations over California and an ...

Abstract: This paper illustrates a method of blending stagewise and stepwise regression procedures for selecting predictors and deriving equations. Only a few minutes of large-scale computer time were required to screen almost 4500 ...

Abstract: Observations of hourly sunshine, angular elevation of the sun above the horizon, cloud cover, and a three-dimensional cloud model, were utilized to derive a set of cloud width, thickness, and spacing values for estimating ...

Abstract: Signals transmitted through the atmosphere in the visible and infrared portions of the electromagnetic spectrum can be seriously degraded by clouds between the source and the receiver. A previously published model was ...

Abstract: Sea-level pressure values at 22 northeastern United States stations were used to describe the map pattern for each of 445 winter days. Each map pattern was correlated with every other map pattern in order to determine ...

Abstract: A Monte Carlo technique for testing the statistical significance of an estimate by regression is described. It is illustrated on a medium-range prediction of precipitation. The purpose of the technique is to permit the use ...