• MESO: Mesoscale Discussion 0449

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, May 18, 2018 03:04:08
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    ACUS11 KWNS 180304
    SWOMCD
    SPC MCD 180303
    SDZ000-NEZ000-COZ000-180500-

    Mesoscale Discussion 0449
    NWS Storm Prediction Center Norman OK
    1003 PM CDT Thu May 17 2018

    Areas affected...Central South Dakota through much of western and
    central Nebraska

    Concerning...Severe Thunderstorm Watch 100...102...103...

    Valid 180303Z - 180500Z

    The severe weather threat for Severe Thunderstorm Watch 100, 102,
    103 continues.

    SUMMARY...The severe threat will continue across the discussion area
    for the next couple of hours. Damaging wind gusts are the primary
    threat, although large hail remains possible with cellular
    convection and more dominant cores.

    DISCUSSION...Storms have now mostly congealed into a large,
    forward-propagating MCS extending from central South Dakota (near
    Pierre) south-southwestward to near Sidney, NE currently. More
    cellular convection was located on the southwestern flank of the
    complex near the Sidney area, with occasional large hail reported
    and indicated on radar. Elsewhere, occasional severe wind gusts
    have been reported with the MCS, and this activity should continue
    for the next couple of hours or so as storms continue to reside in a north-to-south oriented instability axis across the region. The
    remainder of the severe threat will likely be handled with continued
    local space/time extensions of ongoing watches, which will be
    coordinated with local WFOs as needed. This threat may persist
    beyond 05Z in portions of Nebraska, where storms will have a longer
    residence time within the axis of moderate instability.

    ..Cook/Hart.. 05/18/2018

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

    ATTN...WFO...FSD...ABR...LBF...UNR...BOU...CYS...

    LAT...LON 41150323 41430282 41950256 42530227 42970195 43590162
    44120120 44490082 44690044 44749997 44619951 44379930
    43909920 43119930 42319935 41639968 41110033 40700127
    40600230 40700291 41150323



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, April 26, 2019 02:09:16
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    ACUS11 KWNS 260209
    SWOMCD
    SPC MCD 260208
    FLZ000-260315-

    Mesoscale Discussion 0449
    NWS Storm Prediction Center Norman OK
    0908 PM CDT Thu Apr 25 2019

    Areas affected...Portions of the FL Panhandle

    Concerning...Tornado Watch 104...

    Valid 260208Z - 260315Z

    The severe weather threat for Tornado Watch 104 continues.

    SUMMARY...Isolated severe threat should persist mainly across
    southern portions of Tornado Watch 104.

    DISCUSSION...A long-lived bowing line segment has moved eastward
    across the northern Gulf of Mexico, and has recently reached the FL
    Coast between Panama City and Apalachicola. Weak instability (MLCAPE
    of 250-500 J/kg) exists downstream of this convection, and strong
    effective bulk shear should continue to support storm organization.
    Isolated instances of strong/gusty winds should be the primary
    threat given the linear mode, but a brief tornado could also occur
    mainly along/near the coast where relatively greater low-level
    moisture is present.

    ..Gleason.. 04/26/2019

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

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

    LAT...LON 29628544 29868541 30168547 30328492 30288391 29958396
    29848431 29548501 29628544



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