A mesoscale analysis of hourly surface data of pressure and precipitation is presented for the case of 10–11 April, during AVE-SESAME 1979. Barograph traces also are used in the analysis. Three distinct pressure waves traveling northeastward across Oklahoma and Missouri are found to be well correlated with thunderstorm activity and heavy rainfall amounts. Wave speeds appeared to propagate at approximately 25 m · s−1 and to have amplitudes ranging from 2 to 6 mb. The average time elapsed between successive wave passages at a particular station was 4 h. A ridge of high pressure passed a station about one hour after heavy precipitation had occurred.
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