• MESO: Mesoscale Discussion 0264

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sunday, April 15, 2018 10:42:31
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    ACUS11 KWNS 151042
    SWOMCD
    SPC MCD 151042
    GAZ000-FLZ000-ALZ000-151215-

    Mesoscale Discussion 0264
    NWS Storm Prediction Center Norman OK
    0542 AM CDT Sun Apr 15 2018

    Areas affected...far southeast Alabama...far southwest Georgia...and
    the central Florida Panhandle

    Concerning...Tornado Watch 50...

    Valid 151042Z - 151215Z

    The severe weather threat for Tornado Watch 50 continues.

    SUMMARY...Severe risk has diminished, with additional risk unlikely.

    DISCUSSION...Latest radar loop shows convection weakening and become
    more disorganized across the remainder of WW 50, with the leading
    band of storms now near the eastern fringe of the watch. With weak
    downstream instability and severe risk minimal at best, it appears
    that threat has largely ended across the area and no downstream
    watch appears necessary.

    ..Goss.. 04/15/2018

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

    ATTN...WFO...FFC...TAE...

    LAT...LON 28648499 28788576 29628574 31878490 31928461 31308452
    30228493 28648499



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, April 06, 2019 19:10:27
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    ACUS11 KWNS 061810
    SWOMCD
    SPC MCD 061809
    LAZ000-TXZ000-ARZ000-061945-

    Mesoscale Discussion 0264
    NWS Storm Prediction Center Norman OK
    0109 PM CDT Sat Apr 06 2019

    Areas affected...Central/Southeast/East TX

    Concerning...Tornado Watch 38...

    Valid 061809Z - 061945Z

    The severe weather threat for Tornado Watch 38 continues.

    SUMMARY...Threat for all severe hazards, including tornadoes,
    continues across central, southeast, and east TX.

    DISCUSSION...Warm-air advection continues to promote thunderstorm
    development across the warm frontal zone extending from central TX
    into western/northwestern LA. This frontal zone currently remains
    fairly diffuse, but the ongoing precipitation coupled with daytime
    heating and continue low-level moisture advection should allow the
    front to sharpen over the next few hours. Presently, the sharpest
    portion of the frontal zone extends from Milam County
    eastward-northeastward to Sabine County (delineated fairly well by
    the 70 deg F isotherm).

    Elevated thunderstorms continue along north of this boundary with
    steep mid-level lapse rates and strong vertical shear supporting
    updrafts and occasionally instances of hail and/or strong wind
    gusts.

    Threat for more surface-based convective will increase over the next
    several hours as low-level moisture advection continues and forcing
    for ascent persists. Low- to mid-level southerly winds are expected
    to increase during this time as well. These factors will lead to a
    higher tornado threat.

    ..Mosier.. 04/06/2019

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

    ATTN...WFO...LCH...SHV...HGX...FWD...EWX...SJT...

    LAT...LON 31729848 33299402 32719401 30969399 30209629 29429849
    31369846 31729848



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