• MESO: Mesoscale Discussion 1464

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sunday, September 16, 2018 15:09:54
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    ACUS11 KWNS 161509
    SWOMCD
    SPC MCD 161509
    NCZ000-SCZ000-161715-

    Mesoscale Discussion 1464
    NWS Storm Prediction Center Norman OK
    1009 AM CDT Sun Sep 16 2018

    Areas affected...Eastern South Carolina/North Carolina border area

    Concerning...Tornado Watch 379...

    Valid 161509Z - 161715Z

    The severe weather threat for Tornado Watch 379 continues.

    SUMMARY...Increasing risk for tornadoes possible through 1-4 PM EDT,
    with convection, including thunderstorm activity, now forming near
    the eastern North and South Carolina border area.

    DISCUSSION...Breaks in overcast appear to be allowing for the
    development of weak to moderate boundary layer CAPE (increasing in
    excess of 1000 J/kg) within a narrow corridor straddling the eastern
    North and South Carolina border. This is within inflow of very
    moist air off the Atlantic, in the presence of residual moderately
    strong southerly low-level flow (on the order of 40 kt around 850
    mb) to the east of the circulation center of Florence. Based on
    recent VWP data from Wilmington NC, low-level hodographs remain
    sizable and clockwise curved, and supportive of the development of
    sustained low-level mesocyclones in stronger convective development.
    It appears possible that this could be accompanied by increasing
    potential for tornadoes through the 17-20Z time frame.

    ..Kerr.. 09/16/2018

    ...Please see www.spc.noaa.gov for graphic product...

    ATTN...WFO...RAH...ILM...CAE...

    LAT...LON 35197973 34997889 34457814 33487828 32947870 33437934
    34157971 34708017 35197973



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sunday, September 16, 2018 15:22:55
    This is a multi-part message in MIME format...

    ------------=_1537111380-46358-10250
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    ACUS11 KWNS 161522
    SWOMCD
    SPC MCD 161522
    NCZ000-SCZ000-161715-

    Mesoscale Discussion 1464
    NWS Storm Prediction Center Norman OK
    1022 AM CDT Sun Sep 16 2018

    Areas affected...Eastern South Carolina/North Carolina border area

    Concerning...Tornado Watch 379...

    Valid 161522Z - 161715Z

    The severe weather threat for Tornado Watch 379 continues.

    SUMMARY...Increasing risk for tornadoes possible through 1-4 PM EDT,
    with convection, including thunderstorm activity, now forming near
    the eastern North and South Carolina border area.

    DISCUSSION...Breaks in overcast appear to be allowing for the
    development of weak to moderate boundary layer CAPE (increasing in
    excess of 1000 J/kg) within a narrow corridor straddling the eastern
    North and South Carolina border. This is within inflow of very
    moist air off the Atlantic, in the presence of residual moderately
    strong southerly low-level flow (on the order of 40 kt around 850
    mb) to the east of the circulation center of Florence. Based on
    recent VWP data from Wilmington NC, low-level hodographs remain
    sizable and clockwise curved, and supportive of the development of
    sustained low-level mesocyclones in stronger convective development.
    It appears possible that this could be accompanied by increasing
    potential for tornadoes through the 17-20Z time frame.

    ..Kerr.. 09/16/2018

    ...Please see www.spc.noaa.gov for graphic product...

    ATTN...WFO...RAH...ILM...CAE...

    LAT...LON 35197973 34997889 34457814 33487828 32947870 33437934
    34157971 34708017 35197973



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