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    A Climatology of Extratropical Cyclones Leading to Extreme Weather Events over Central and Eastern North America

    Source: Monthly Weather Review:;2019:;volume 147:;issue 005::page 1471
    Author:
    Bentley, Alicia M.
    ,
    Bosart, Lance F.
    ,
    Keyser, Daniel
    DOI: 10.1175/MWR-D-18-0453.1
    Publisher: American Meteorological Society
    Abstract: AbstractCool-season extreme weather events (EWEs) (i.e., high-impact weather events that are societally disruptive, geographically widespread, exceptionally prolonged, and climatologically infrequent) are typically associated with strong extratropical cyclones (ECs). The opportunity to investigate the genesis locations, tracks, and frequencies of ECs leading to EWEs over central and eastern North America and compare them to those of ordinary ECs forming over and traversing the same region motivates this study. ECs leading to EWEs are separated from ordinary ECs according to the magnitude, areal extent, and duration of their 925-hPa standardized wind speed anomalies in the 0.5° NCEP CFSR dataset. This separation allows for the construction of an October?March 1979?2016 climatology of ECs leading to EWEs over central and eastern North America. The climatology of ECs leading to EWEs over central and eastern North America reveals that these ECs typically form in the lee of the Rocky Mountains, over the south-central United States, and along the east coast of North America at latitudes equatorward of the typical genesis locations of ordinary ECs. ECs leading to EWEs exhibit equatorward-shifted tracks relative to ordinary ECs, likely associated with an equatorward shift in the position of the subtropical or polar-front jet. ECs leading to EWEs form most frequently in November and March, when the seasonal alignment of baroclinic and diabatic forcings is maximized. Similar to ordinary ECs, the genesis locations, tracks, and frequencies of ECs leading to EWEs are partially determined by the states of the Pacific?North American pattern and North Atlantic Oscillation.
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      A Climatology of Extratropical Cyclones Leading to Extreme Weather Events over Central and Eastern North America

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    contributor authorBentley, Alicia M.
    contributor authorBosart, Lance F.
    contributor authorKeyser, Daniel
    date accessioned2019-10-05T06:56:06Z
    date available2019-10-05T06:56:06Z
    date copyright2/22/2019 12:00:00 AM
    date issued2019
    identifier otherMWR-D-18-0453.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263880
    description abstractAbstractCool-season extreme weather events (EWEs) (i.e., high-impact weather events that are societally disruptive, geographically widespread, exceptionally prolonged, and climatologically infrequent) are typically associated with strong extratropical cyclones (ECs). The opportunity to investigate the genesis locations, tracks, and frequencies of ECs leading to EWEs over central and eastern North America and compare them to those of ordinary ECs forming over and traversing the same region motivates this study. ECs leading to EWEs are separated from ordinary ECs according to the magnitude, areal extent, and duration of their 925-hPa standardized wind speed anomalies in the 0.5° NCEP CFSR dataset. This separation allows for the construction of an October?March 1979?2016 climatology of ECs leading to EWEs over central and eastern North America. The climatology of ECs leading to EWEs over central and eastern North America reveals that these ECs typically form in the lee of the Rocky Mountains, over the south-central United States, and along the east coast of North America at latitudes equatorward of the typical genesis locations of ordinary ECs. ECs leading to EWEs exhibit equatorward-shifted tracks relative to ordinary ECs, likely associated with an equatorward shift in the position of the subtropical or polar-front jet. ECs leading to EWEs form most frequently in November and March, when the seasonal alignment of baroclinic and diabatic forcings is maximized. Similar to ordinary ECs, the genesis locations, tracks, and frequencies of ECs leading to EWEs are partially determined by the states of the Pacific?North American pattern and North Atlantic Oscillation.
    publisherAmerican Meteorological Society
    titleA Climatology of Extratropical Cyclones Leading to Extreme Weather Events over Central and Eastern North America
    typeJournal Paper
    journal volume147
    journal issue5
    journal titleMonthly Weather Review
    identifier doi10.1175/MWR-D-18-0453.1
    journal fristpage1471
    journal lastpage1490
    treeMonthly Weather Review:;2019:;volume 147:;issue 005
    contenttypeFulltext
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