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Surface Signatures of a Dry Nocturnal Gust Front

Robert W. ScottIllinois State Water Survey, Champaign, IL 61820

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Bernice AckermanIllinois State Water Survey, Champaign, IL 61820

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Abstract

Sudden changes in surface meteorological parameters were observed to propagate across a densely-instrumented network in central Illinois during a summer night in 1979. The changes were due to the outflow from an eastward moving, organized storm system passing well north of the network. Although no precipitation was observed within 45 km of the area (i.e., its passage across the network was “dry"), the change from ambient to outflow air was seen in other surface weather indicators nearly 100 km south of the point at which the outflow is estimated to have been initiated and more than 3 h after the generating storm had dissipated.

Abstract

Sudden changes in surface meteorological parameters were observed to propagate across a densely-instrumented network in central Illinois during a summer night in 1979. The changes were due to the outflow from an eastward moving, organized storm system passing well north of the network. Although no precipitation was observed within 45 km of the area (i.e., its passage across the network was “dry"), the change from ambient to outflow air was seen in other surface weather indicators nearly 100 km south of the point at which the outflow is estimated to have been initiated and more than 3 h after the generating storm had dissipated.

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