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    Diagnosis of the Source and Evolution of Medium-Range Forecast Errors for Extratropical Cyclone Joachim

    Source: Weather and Forecasting:;2016:;volume( 031 ):;issue: 004::page 1197
    Author:
    Lamberson, William S.
    ,
    Torn, Ryan D.
    ,
    Bosart, Lance F.
    ,
    Magnusson, Linus
    DOI: 10.1175/WAF-D-16-0026.1
    Publisher: American Meteorological Society
    Abstract: edium-range forecasts for Cyclone Joachim, an extratropical cyclone that impacted western Europe on 16 December 2011, consistently predicted a high-impact intense cyclone; however, these forecasts failed to verify. The potential source and propagation of forecast errors for this case are diagnosed from the 51-member European Centre for Medium-Range Forecasts Ensemble Prediction System initialized 5 days prior to the cyclone?s landfall. Ensemble members are subdivided into two groups: one that contained the eight members that had the most accurate forecast of Joachim and, the other, the eight members that predicted the most intense cyclone. Composite differences between these two subgroups indicate that the difference between these forecasts originate in tropopause-based subsynoptic waves along a deep trough in the eastern Pacific. These errors move eastward over a northern stream ridge centered on the west coast of North America and modulate the evolution of a trough that dives equatorward out of Canada and is associated with the development of Joachim. Forecast error calculations and relaxation experiments indicate that reducing forecast errors associated with these subsynoptic features leads to more accurate forecasts. These results present further evidence that subsynoptic errors, especially those originating in the warm sector of a cyclone, can be a significant source of downstream forecast errors.
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      Diagnosis of the Source and Evolution of Medium-Range Forecast Errors for Extratropical Cyclone Joachim

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4231982
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    contributor authorLamberson, William S.
    contributor authorTorn, Ryan D.
    contributor authorBosart, Lance F.
    contributor authorMagnusson, Linus
    date accessioned2017-06-09T17:37:21Z
    date available2017-06-09T17:37:21Z
    date copyright2016/08/01
    date issued2016
    identifier issn0882-8156
    identifier otherams-88225.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4231982
    description abstractedium-range forecasts for Cyclone Joachim, an extratropical cyclone that impacted western Europe on 16 December 2011, consistently predicted a high-impact intense cyclone; however, these forecasts failed to verify. The potential source and propagation of forecast errors for this case are diagnosed from the 51-member European Centre for Medium-Range Forecasts Ensemble Prediction System initialized 5 days prior to the cyclone?s landfall. Ensemble members are subdivided into two groups: one that contained the eight members that had the most accurate forecast of Joachim and, the other, the eight members that predicted the most intense cyclone. Composite differences between these two subgroups indicate that the difference between these forecasts originate in tropopause-based subsynoptic waves along a deep trough in the eastern Pacific. These errors move eastward over a northern stream ridge centered on the west coast of North America and modulate the evolution of a trough that dives equatorward out of Canada and is associated with the development of Joachim. Forecast error calculations and relaxation experiments indicate that reducing forecast errors associated with these subsynoptic features leads to more accurate forecasts. These results present further evidence that subsynoptic errors, especially those originating in the warm sector of a cyclone, can be a significant source of downstream forecast errors.
    publisherAmerican Meteorological Society
    titleDiagnosis of the Source and Evolution of Medium-Range Forecast Errors for Extratropical Cyclone Joachim
    typeJournal Paper
    journal volume31
    journal issue4
    journal titleWeather and Forecasting
    identifier doi10.1175/WAF-D-16-0026.1
    journal fristpage1197
    journal lastpage1214
    treeWeather and Forecasting:;2016:;volume( 031 ):;issue: 004
    contenttypeFulltext
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