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  • MESO: Mesoscale Discussion 0146

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Feb 12 08:08:03 2023
    ACUS11 KWNS 120807
    SWOMCD
    SPC MCD 120807 COR
    NCZ000-VAZ000-TNZ000-121100-

    Mesoscale Discussion 0146
    NWS Storm Prediction Center Norman OK
    0207 AM CST Sun Feb 12 2023

    Areas affected...southwestern Virginia and northwestern North
    Carolina

    Concerning...Winter mixed precipitation=20

    Valid 120807Z - 121100Z

    CORRECTED FOR DIRECTIONS

    SUMMARY...Rain transitioning to snow and mixed precipitation over
    the next few hours. Potential for freezing rain rates up to a
    .10"/hr possible.

    DISCUSSION...Water-vapor imagery of an upper level low currently
    located over the Southeast showed a pronounced dry slot region
    impinging across portions of Tennessee and the Carolinas. Ahead of
    this feature, ongoing convective showers have shown intermittent
    changes to sleet and brief snowfall. Surface temperatures have
    struggled to drop below freezing in most locations. Wet-bulbing is
    occurring, as shown by a drop in the freezing level from KHLX in
    Blacksburg, where the freezing level dropped from around 2000 ft AGL
    to 1300 ft AGL in the last hour. Additionally, surface temperatures
    in northwestern North Carolina near Jefferson have dropped to 32 F
    at the last observation. Further north into Virginia, light snow was
    reported in observations from Hillsville. The main factor in
    accumulations of any wintry precipitation will be the degree of
    wet-bulb cooling that can occur before the dry slot begins to
    intrude into the region and reduce precipitation intensity. Given
    current observations and trends in radar and satellite, a transition
    to mixed precipitation should continue. A brief period of freezing
    rain with rates up to a 0.10"/hr may lead to minor ice accumulations
    and slick travel.

    ..Thornton/Edwards.. 02/12/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!59Jq-rzjvzysjWb-33MNzWYAiMzOvY38vVI9E6VZw0iPEzQ_8bKrfv_2BUryR0bN4sh66jrLX= kmezQdot4TShIFUMnE$ for graphic product...

    ATTN...WFO...RNK...RLX...MRX...

    LAT...LON 36738237 37078232 37198168 37228134 37118096 36928069
    36678066 36428073 36378175 36738237=20


    =3D =3D =3D
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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Feb 12 07:59:30 2023
    ACUS11 KWNS 120759
    SWOMCD
    SPC MCD 120758=20
    NCZ000-VAZ000-TNZ000-121100-

    Mesoscale Discussion 0146
    NWS Storm Prediction Center Norman OK
    0158 AM CST Sun Feb 12 2023

    Areas affected...southeastern Virginia and northeastern North
    Carolina

    Concerning...Winter mixed precipitation=20

    Valid 120758Z - 121100Z

    SUMMARY...Rain transitioning to snow and mixed precipitation over
    the next few hours. Potential for freezing rain rates up to a
    .10"/hr possible.

    DISCUSSION...Water-vapor imagery of an upper level low currently
    located over the southeast showed a pronounced dry slot region
    impinging across portions of Tennessee and the Carolinas. Ahead of
    this feature, ongoing convective showers have shown intermittent
    changes to sleet and brief snowfall. Surface temperatures have
    struggled to drop below freezing in most locations. Wet-bulbing is
    occurring, as shown by a drop in the freezing level from KHLX in
    Blacksburg, where the freezing level dropped from around 2000 ft AGL
    to 1300 ft AGL in the last hour. Additionally, surface temperatures
    in northeastern North Carolina near Jefferson have dropped to 32 F
    at the last observation. Further north into Virginia, light snow was
    reported in observations from Hillsville. The main factor in
    accumulations of any wintry precipitation will be the degree of
    wet-bulb cooling that can occur before the dry slot begins to
    intrude into the region and reduce precipitation intensity. Given
    current observations and trends in radar and satellite, a transition
    to mixed precipitation should continue. A brief period of freezing
    rain with rates up to a 0.10"/hr may lead to minor ice accumulations
    and slick travel.

    ..Thornton/Edwards.. 02/12/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!-zIyrVaUSY24h-y3KsR_nBag2sW1fMcGqiVf4B6l3XHfRsLkXOTUbYVBtAJLfirKNWRd_p9E2= Kl3tIM7sZ0zmfM0Ndc$ for graphic product...

    ATTN...WFO...RNK...RLX...MRX...

    LAT...LON 36738237 37078232 37198168 37228134 37118096 36928069
    36678066 36428073 36378175 36738237=20


    =3D =3D =3D
    To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM.

    --- SBBSecho 3.14-Linux
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