Diurnal Variation of Summertime Thunderstorm Activity over the United States.
ENVIRONMENTAL TECHNICAL APPLICATIONS CENTER (AIR FORCE) WASHINGTON D C
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Observations from 294 Air Force and National Weather Service Stations scattered throughout the United States were used to study the diurnal variation of summertime thunderstorm activity. The results of this study are summarized in isoline frequency charts giving monthly values of the 24-hour mean, the variance of the mean hourly values, hours of maximum frequency, and the phase, amplitude, and explained variance of the diurnal and semidiurnal harmonics. Author