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DAVID B. SPIEGLER

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DAVID B. SPIEGLER

Abstract

A detailed analysis of conventional and aircraft reconnaissance data and satellite pictures for two unnamed Atlantic Ocean cyclones during 1970 indicates that the storms were of tropical nature and were probably of at least minimal hurricane intensity for part of their life history.

Prior to becoming a hurricane, one of the storms exhibited characteristics not typical of any of the recognized classical cyclone types [i.e., tropical, extratropical, and subtropical (Kona)]. The implications of this are discussed and the concept of semitropical cyclones as a separate cyclone category is advanced.

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DAVID B. SPIEGLER

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The 24-hour 500-mb. barotropic forecasts prepared by the Joint Numerical Weather Prediction Unit (JNWPU) have been investigated in 30 cases of rapid sea level cyclogenesis. Composite error maps are presented for the region of cyclogenesis. The 500-mb. errors are found to be significantly larger when the solenoidal field at that level is strong than when it is weak.

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DAVID B. SPIEGLER
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GEORGE E. FISHER

Abstract

Melted precipitation and snowfall data from eight winters were used to develop a snow and melted precipitation prediction model associated with 850-mb cyclones along the Atlantic Seaboard. Results indicate that the major potential for heavy snow exists in a band extending from 75 to 225 mi to the left and from 350 to about 1,000 mi ahead of the 850-mb cyclone in the 12-hr period beginning 6 hr after routine upper air observation time. Application of the prediction model of snow amounts to some storms from the 1968–1969 winter season indicate they provide valuable guidance to the forecaster during periods of East Coast storms.

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