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Paul J. Hebert

Abstract

A five-year study for the period 1968–72 evaluated several of the factors which have been generally considered favorable for the development of a tropical depression into a tropical storm or hurricane. The study area considered all depressions in the western North Atlantic south of latitude 35°N and west of longitude 55°W.

The individual and cumulative importance of these factors as criteria for assessing the potential for development of a tropical depression into a tropical storm within 24 h is discussed.

The results of the study have led to modifications of the criteria for operational use at the National Hurricane Center (NHC). The criteria currently used at NHC are presented together with a brief discussion of plans to obtain objectively a quantitative development potential index for all intensity stages of tropical cyclones.

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Paul J. Hebert

Abstract

A seasonal summary of the 1975 Atlantic hurricane season is followed by accounts of the individual storms and hurriances.

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Paul J. Hebert

Abstract

A general summary of the 1979 hurricane season is presented. Included are highlights of the season, comparisons of activity in recent years with long-term averages, and comment on large-scale atmospheric features which prevailed during the season and their impact on storm tracks. Finally, there are accounts of individual storms, which give meteorological details and the influence of synoptic features on their tracks and intensity.

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Neil L. Frank and Paul J. Hebert

Abstract

The 1973 hurricane season featured 95 “tropical systems” of which 24 acquired the closed circulation of a depression. Atlantic “seedlings” were responsible for the seven named storms in the Atlantic and seven of the twelve East Pacific storms. Fifty-six of the systems originated over Africa.

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R. H. SIMPSON and PAUL J. HEBERT

Abstract

A general overview of the 1972 hurricane season in the North Atlantic is presented together with detailed accounts of all named tropical cyclones.

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Paul J. Hebert and Neil L. Frank

Abstract

The general overview of the 1973 hurricane season in the North Atlantic is presented together with detailed accounts of all named tropical storms.

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ARNOLD L. SUGG and PAUL J. HEBERT

Abstract

The 1968 hurricane season in the North Atlantic area, considered in its entirety, and synoptic and statistical aspects of individual storms are discussed.

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Paul J. Hebert and C. L. Jordan

Abstract

Mean aerological data for the Gulf of Mexico area have been prepared from 10-year records for three stations. Mean monthly height, temperature, and relative humidity data are tabulated for constant pressure surfaces. More detailed information, including density, potential temperature, and specific humidity, is shown for the mean “hurricane season” sounding. The mean data are compared with those previously presented for the West Indies area and some of the interesting climatological features are discussed.

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