Abstract

Storm rainfall variability over Connecticut was investigated by using data from the 66 cooperative rain gages of the National Weather Service supplemented by 70 volunteer stations. The analyses concentrated on large-scale stratiform type rainstorms. Much of the observed rainfall variability within storms can best be explained by variations in terrain. A minimum in rainfall generally occurs in the Connecticut River valley and along the coastal plain and a maximum on the windward side of the hills. The wind direction at hilltop level is an important factor in explaining differences in the rainfall pattern between storms. More upper-air stations and more frequent soundings would be needed to assess the importance of other atmospheric variables in influencing the effectiveness of topography as a modifier of precipitation patterns. The results of this study emphasize the importance of topography, even in regions with small elevation differences, when attempts are being made to evaluate man's planned or inadvertent modification of precipitation.

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