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    The Utility of Additional Soundings for Forecasting Lake-Effect Snow in the Great Lakes Region

    Source: Weather and Forecasting:;2001:;volume( 016 ):;issue: 004::page 448
    Author:
    Scott, Christopher P. J.
    ,
    Sousounis, Peter J.
    DOI: 10.1175/1520-0434(2001)016<0448:TUOASF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The impact of initializing a mesoscale model with additional sounding data over the Great Lakes region is investigated. As part of the Lake-Induced Convection Experiment (Lake-ICE) field study during the winter of 1997/98, six supplementary Cross-chain Loran Atmospheric Sounding System (CLASS) units and three Integrated Sounding System (ISS) units were used in addition to those from the standard synoptic upper-air network. The three ISS units were in the vicinity of Lake Michigan, and the six CLASS units were in the data-sparse region of central and northeastern Ontario and western Quebec. The Pennsylvania State University?National Center for Atmospheric Research fifth-generation Mesoscale Model running on a doubly nested grid is used to simulate the lake-effect snow event of 4?5 December 1997. This model output from a 30-km horizontal resolution grid shows that the six CLASS soundings capture a warm layer below 850 hPa that appears to be the result of diabatic heating from the Great Lakes. This leads to an improved simulation of the surface pressure fields over the course of the simulation. A nested 10-km horizontal resolution grid shows that the initialization data from the CLASS sites seemed to have a greater influence on the propagation of a mesoalpha-scale trough that caused significant snowfall to the lee of Lake Michigan than data from the ISS sites. The inclusion of the CLASS sounding data changes the track of the precipitation maximum by approximately 25 km and agrees better with reflectivity data from the Weather Surveillance Radar-1988 Doppler. Implications for forecasters in the Great Lakes region are discussed.
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      The Utility of Additional Soundings for Forecasting Lake-Effect Snow in the Great Lakes Region

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4169378
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    contributor authorScott, Christopher P. J.
    contributor authorSousounis, Peter J.
    date accessioned2017-06-09T15:00:20Z
    date available2017-06-09T15:00:20Z
    date copyright2001/08/01
    date issued2001
    identifier issn0882-8156
    identifier otherams-3188.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4169378
    description abstractThe impact of initializing a mesoscale model with additional sounding data over the Great Lakes region is investigated. As part of the Lake-Induced Convection Experiment (Lake-ICE) field study during the winter of 1997/98, six supplementary Cross-chain Loran Atmospheric Sounding System (CLASS) units and three Integrated Sounding System (ISS) units were used in addition to those from the standard synoptic upper-air network. The three ISS units were in the vicinity of Lake Michigan, and the six CLASS units were in the data-sparse region of central and northeastern Ontario and western Quebec. The Pennsylvania State University?National Center for Atmospheric Research fifth-generation Mesoscale Model running on a doubly nested grid is used to simulate the lake-effect snow event of 4?5 December 1997. This model output from a 30-km horizontal resolution grid shows that the six CLASS soundings capture a warm layer below 850 hPa that appears to be the result of diabatic heating from the Great Lakes. This leads to an improved simulation of the surface pressure fields over the course of the simulation. A nested 10-km horizontal resolution grid shows that the initialization data from the CLASS sites seemed to have a greater influence on the propagation of a mesoalpha-scale trough that caused significant snowfall to the lee of Lake Michigan than data from the ISS sites. The inclusion of the CLASS sounding data changes the track of the precipitation maximum by approximately 25 km and agrees better with reflectivity data from the Weather Surveillance Radar-1988 Doppler. Implications for forecasters in the Great Lakes region are discussed.
    publisherAmerican Meteorological Society
    titleThe Utility of Additional Soundings for Forecasting Lake-Effect Snow in the Great Lakes Region
    typeJournal Paper
    journal volume16
    journal issue4
    journal titleWeather and Forecasting
    identifier doi10.1175/1520-0434(2001)016<0448:TUOASF>2.0.CO;2
    journal fristpage448
    journal lastpage462
    treeWeather and Forecasting:;2001:;volume( 016 ):;issue: 004
    contenttypeFulltext
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