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    On the Reliability of Hook Echoes as Tornado Indicators

    Source: Monthly Weather Review:;1981:;volume( 109 ):;issue: 007::page 1457
    Author:
    Forbes, Gregory S.
    DOI: 10.1175/1520-0493(1981)109<1457:OTROHE>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A study of radar echoes associated with the tornadoes of the 3 April 1974 outbreak was performed to evaluate the usefulness of echo shape as an indicator of tornadic thunderstorms. The hook shape was usually successful in characterizing an echo as tornadic, with a false alarm rate of 169%. Because hook echoes were relatively rare, however, a less restrictive shape called distinctive was more successful at detecting tornadic thunderstorms, identifying 65% of the tornadic echoes. An echo had a distinctive shape if it possessed a marked appendage on its right rear flank or was in the shape of a spiral, comma or line echo wave pattern (LEWP). Characteristics of the distinctive echo are given.
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      On the Reliability of Hook Echoes as Tornado Indicators

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4200528
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    contributor authorForbes, Gregory S.
    date accessioned2017-06-09T16:03:29Z
    date available2017-06-09T16:03:29Z
    date copyright1981/07/01
    date issued1981
    identifier issn0027-0644
    identifier otherams-59917.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4200528
    description abstractA study of radar echoes associated with the tornadoes of the 3 April 1974 outbreak was performed to evaluate the usefulness of echo shape as an indicator of tornadic thunderstorms. The hook shape was usually successful in characterizing an echo as tornadic, with a false alarm rate of 169%. Because hook echoes were relatively rare, however, a less restrictive shape called distinctive was more successful at detecting tornadic thunderstorms, identifying 65% of the tornadic echoes. An echo had a distinctive shape if it possessed a marked appendage on its right rear flank or was in the shape of a spiral, comma or line echo wave pattern (LEWP). Characteristics of the distinctive echo are given.
    publisherAmerican Meteorological Society
    titleOn the Reliability of Hook Echoes as Tornado Indicators
    typeJournal Paper
    journal volume109
    journal issue7
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1981)109<1457:OTROHE>2.0.CO;2
    journal fristpage1457
    journal lastpage1466
    treeMonthly Weather Review:;1981:;volume( 109 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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