• MESO: Mesoscale Discussion 0529

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, May 26, 2018 17:10:19
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    ACUS11 KWNS 261710
    SWOMCD
    SPC MCD 261709
    MEZ000-MAZ000-NHZ000-VTZ000-NYZ000-261945-

    Mesoscale Discussion 0529
    NWS Storm Prediction Center Norman OK
    1209 PM CDT Sat May 26 2018

    Areas affected...From northeast New York across Vermont...New
    Hampshire...and into far southern Maine

    Concerning...Severe potential...Watch unlikely

    Valid 261709Z - 261945Z

    Probability of Watch Issuance...5 percent

    SUMMARY...Scattered thunderstorms are likely to develop over the
    next 2-3 hours, with a few strong wind gusts or small hail possible.

    DISCUSSION...Visible imagery shows CU increasing near a front from
    northeastern NY toward southern ME. A warm air mass exists to the
    south across southern New England, and some further heating will
    occur through broken clouds near the front. Low-level flow is a bit
    veered, but glancing warm advection is possible into the area,
    aiding the development of weak instability. Mean wind speeds in the
    low-levels are relatively weak, but increasing flow aloft may yield
    a few semi-organized, persistent storms, thereby maximizing the
    probability of a strong wind gust or small hail report.

    ..Jewell/Hart.. 05/26/2018

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

    ATTN...WFO...GYX...BOX...BTV...ALY...

    LAT...LON 44117378 44077294 44037210 43827085 43727045 43587011
    43057007 42617036 42487087 43087308 43407365 43667396
    43887397 44117378



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, May 04, 2019 16:51:22
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    ACUS11 KWNS 041651
    SWOMCD
    SPC MCD 041650
    GAZ000-FLZ000-ALZ000-MSZ000-LAZ000-041815-

    Mesoscale Discussion 0529
    NWS Storm Prediction Center Norman OK
    1150 AM CDT Sat May 04 2019

    Areas affected...southeast Mississippi...central and southern
    Arkansas...far western Georgia...and the western half of the Florida
    Panhandle

    Concerning...Severe potential...Watch likely

    Valid 041650Z - 041815Z

    Probability of Watch Issuance...80 percent

    SUMMARY...Severe -- and possibly isolated tornado -- risk is
    expected to increase over the next 1-2 hours, with watch issuance
    becoming increasingly likely over the next hour or so.

    DISCUSSION...Despite a plume of high-level cloud cover spreading
    east across the central Gulf Coast region, objective analysis shows
    that heating via filtered sunshine of the moist Gulf airmass across
    the discussion area is resulting in a gradually destabilizing
    environment, with mixed-layer CAPE now near 1500 J/kg. As a result,
    continued eastward advance of the fairly well-organized convective
    line crossing far eastern Louisiana is observed, with additional,
    pre-line cellular development also noted over southeast Mississippi.

    As modest additional destabilization supports further increases in
    storm coverage/intensity, the moderate west-southwest deep-layer
    wind field observed across the area should also help to sustain
    storm organization and some intensification over the next several
    hours. While flow is generally unidirectional/southwesterly across
    much of the region, suggesting that damaging outflow winds will be
    the main severe risk, some backing of the low-level flow is noted
    over southern portions of the area near the Gulf coast. Here, some
    enhancement to tornado potential is apparent -- and indeed some
    rotation/small circulations have been observed at times within the
    convective band. As such, we will continue to monitor environmental
    and convective evolution, as it pertains to potential watch type.

    ..Goss/Guyer.. 05/04/2019

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

    ATTN...WFO...FFC...TAE...BMX...MOB...JAN...LIX...

    LAT...LON 29028915 29688934 30398967 31098963 32098891 33028741
    33468574 33038502 31878479 30808489 30028579 29558729
    29258794 29028915



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, May 04, 2019 16:58:51
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    ACUS11 KWNS 041658
    SWOMCD
    SPC MCD 041658 COR
    GAZ000-FLZ000-ALZ000-MSZ000-LAZ000-041815-

    Mesoscale Discussion 0529
    NWS Storm Prediction Center Norman OK
    1158 AM CDT Sat May 04 2019

    Areas affected...southeast Mississippi...central and southern
    Alabama...far western Georgia...and the western half of the Florida
    Panhandle

    Concerning...Severe potential...Watch likely

    Valid 041658Z - 041815Z

    CORRECTED TO CHANGE ARKANSAS TO ALABAMA IN THE GEOGRAPHIC HEADER

    Probability of Watch Issuance...80 percent

    SUMMARY...Severe -- and possibly isolated tornado -- risk is
    expected to increase over the next 1-2 hours, with watch issuance
    becoming increasingly likely over the next hour or so.

    DISCUSSION...Despite a plume of high-level cloud cover spreading
    east across the central Gulf Coast region, objective analysis shows
    that heating via filtered sunshine of the moist Gulf airmass across
    the discussion area is resulting in a gradually destabilizing
    environment, with mixed-layer CAPE now near 1500 J/kg. As a result,
    continued eastward advance of the fairly well-organized convective
    line crossing far eastern Louisiana is observed, with additional,
    pre-line cellular development also noted over southeast Mississippi.

    As modest additional destabilization supports further increases in
    storm coverage/intensity, the moderate west-southwest deep-layer
    wind field observed across the area should also help to sustain
    storm organization and some intensification over the next several
    hours. While flow is generally unidirectional/southwesterly across
    much of the region, suggesting that damaging outflow winds will be
    the main severe risk, some backing of the low-level flow is noted
    over southern portions of the area near the Gulf coast. Here, some
    enhancement to tornado potential is apparent -- and indeed some
    rotation/small circulations have been observed at times within the
    convective band. As such, we will continue to monitor environmental
    and convective evolution, as it pertains to potential watch type.

    ..Goss/Guyer.. 05/04/2019

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

    ATTN...WFO...FFC...TAE...BMX...MOB...JAN...LIX...

    LAT...LON 29028915 29688934 30398967 31098963 32098891 33028741
    33468574 33038502 31878479 30808489 30028579 29558729
    29258794 29028915



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