NOTE ON DEEP EASTERLY WINDS OVER THE MIDDLE WEST ON JANUARY 24, 25, AND 26, 1921

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  • 1 Weather Bureau, Washington, D. C
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Abstract

SYNOPSIS

Kite flights and pilot balloon observations made in the north-central portion of the United States on January 24, 25, and 26, 1931, showed easterly winds persisting to heights of 3 kilometers or more. Easterly winds at these altitudes are rare in the United States during the winter season on account of the strong latitudinal temperature gradients usually existing. Pressure was generally high to the north of this region and low in the south, with a moderately steep surface temperature gradient extending from south to north. A large temperature inversion at Ellendale, however, caused the pressure to remain higher over this region, at least to 3 kilometers, than at Drexel where iso-thermal conditions obtained to 2,500 meters elevation.

Abstract

SYNOPSIS

Kite flights and pilot balloon observations made in the north-central portion of the United States on January 24, 25, and 26, 1931, showed easterly winds persisting to heights of 3 kilometers or more. Easterly winds at these altitudes are rare in the United States during the winter season on account of the strong latitudinal temperature gradients usually existing. Pressure was generally high to the north of this region and low in the south, with a moderately steep surface temperature gradient extending from south to north. A large temperature inversion at Ellendale, however, caused the pressure to remain higher over this region, at least to 3 kilometers, than at Drexel where iso-thermal conditions obtained to 2,500 meters elevation.

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