THE UNNAMED ATLANTIC TROPICAL STORMS OF 1970

DAVID B. SPIEGLER Allied Research Associates, Inc., Concord, Mass.

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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.

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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