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Walter K. Henry

Abstract

The tropical rainstorm over land is extremely variable in both temporal and areal distribution. Usually only one rainstorm (defined to deposit > 10 mm of rain) occurs a day at one place. This paper is restricted to the tropical rainstorm as it occurs over Southeast Asia, Colombia, Panama, and Costa Rica. The size and duration of the rainstorms are discussed. A typical tropical rainstorm is about 30 km in diameter and the core rainfall exceeds 25 mm. More than 60% of the daily rain falls from the rainstorm within a period of one hour. The rainstorms are separated from each other with the area in between receiving little or no rain. Some effects of terrain on the size of the rainstorm and the time of day it occurs are discussed.

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Richard H. Gramzow and Walter K. Henry

Abstract

A rainy pentad is defined as having 25 mm or more rain in five days. The beginning and end of the rainfall of this amount is shown on maps of Central America.

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