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Edward W. Ferguson, Frederick P. Ostby, Preston W. Leftwich Jr., William E. Carle, Steven F. Corfidi, Richard G. Cundy, and William D. Hirt

Abstract

Tornado events of 1983 are reviewed. Significant and interesting aspects of the 931 reported tornadoes are noted. Synoptic patterns associated with four noteworthy tornado days are examined.

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J. Korshover and J. K. Angell

Abstract

The number and location of stagnation days within the eastern United States, as estimated mainly from a surface geostrophic-wind criterion, me presented by month and for the year 1983 as a whole. The distribution of stagnation days in 1983 was quite typical of the 40-year mean, with the number of such days failing halfway between the relatively high number observed in 1981 and the relatively low number observed in 1982. A diagram shows the variation of “grid-point days” of stagnation with latitude and longitude for 1981–1983.

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Robert A. Case and Harold P. Gerrish

Abstract

A general summary of the 1983 hurricane season is presented. Four named tropical cyclones were tracked during the season. Three landfalls occurred. Alicia, the first cyclone of the season, ended a three-year period during which no hurricanes reached the United States coastline.

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D. M. Rodgers, K. W. Howard, and E. C. Johnston

Abstract

An important class of convective weather system, the mesoscale convective complex (MCC), presents many challenges and problems to both the research and operational communities. In addition, thew very large and long-lived thunderstorm systems have a significant social and economic impact resulting from associated severe weather phenomena and widespread beneficial rain. Enhanced infrared satellite images were surveyed to document MCCs which occurred over the United States during 1982. Thirty-seven convective mesosystems were identified that displayed satellite-observable characteristics which satisfied the MCC criteria described by Maddox. Details of the life cycles of the 37 cases are given and several specific cases are discussed. Current and proposed future research will focus on what are perceived to be key questions surrounding these important weather systems. This annual summary is offered as a starting point for scientists interested in pursuing studies of mesoscale convective weather systems.

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J. Korshover and J. K. Angell

Abstract

The number and location of stagnation days within the eastern United States, as estimated mainly from a surface geostrophic-wind criterion, is presented by month and for the year 1982 as a whole. Unlike the situation in 1981 when there were an above-average number of stagnation days in comparison with the period 1936–75, with unique occurrences of stagnation in a belt extending from Minnesota to Maine, the year 1982 seems quite typical with respect to both number and location of stagnation days.

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Gilbert B. Clark

Abstract

Five named tropical cyclones and one subtropical cyclone were tracked during 1982 in the Atlantic–Caribbean–Gulf of Mexico region. There were no landfalling hurricanes.

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R. A. Maddox, D. M. Rodgers, and K. W. Howard

Abstract

Satellite images are used to document the life cycles of Mesoscale Convective Complexes (MCCs) which occurred over the United States during the warm season months of 1981. These systems were found to exhibit characteristics similar to aspects of MCCs discussed recently in the literature; however, the behavior of several of the convective systems poses questions that can only be answered through detailed studies. The systems did produce a variety of significant weather events ranging from severe thunderstorms to locally heavy rains and flooding. Information is also provided for a number of other significant mesoscale convective systems that, although they did not meet the stringent MCC definition criteria, caught the investigators' attention. This documentation should provide a useful starting point for scientists who might wish to pursue studies of mesoscale convective weather systems.

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J. Korshover and J. K. Angell

Abstract

The number and location of stagnation days within the eastern United States, as estimated mainly from a surface geostrophic-wind criterion, is presented by month and for the year 1981 as a whole. In 1981, the number of stagnation days exceeded the 40-year average everywhere except Florida, with a maximum frequency of occurrence somewhat to the west and north of the usual location. There were unique occurrences of stagnation in a belt extending from Minnesota to Maine, including extreme southeastern Canada.

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Miles B. Lawrence and Joseph M. Pelissier

Abstract

Eleven named tropical cyclones and one subtropical cyclone were tracked during 1981 in the Atlantic-Caribbean region. There were no landfalling hurricanes.

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Miles B. Lawrence and Joseph M. Pelissier

Abstract

A summary of the 1980 hurricane season is presented. Eleven named tropical cyclones were tracked, of which nine reached hurricane force. Allen, an intense storm, affected a number of Caribbean countries before making landfall on the Texas coast.

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