• MESO: Mesoscale Discussion 0523

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, May 25, 2018 23:30:22
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    ACUS11 KWNS 252330
    SWOMCD
    SPC MCD 252329
    WIZ000-IAZ000-MNZ000-SDZ000-260130-

    Mesoscale Discussion 0523
    NWS Storm Prediction Center Norman OK
    0629 PM CDT Fri May 25 2018

    Areas affected...Iowa...far southwest Wisconsin...and extreme
    northwest Illinois

    Concerning...Severe potential...Watch unlikely

    Valid 252329Z - 260130Z

    Probability of Watch Issuance...5 percent

    SUMMARY...Thunderstorms are developing/ongoing from central Iowa
    northeast into southwest Wisconsin and will continue to move
    south-southeast this evening. Additional thunderstorms may develop
    to the southwest of these thunderstorms, across portions of central
    into southwest Iowa. Although hail and gusty winds may be possible
    at times with the strongest thunderstorms, the overall severe threat
    will remain too limited for an additional watch.

    DISCUSSION...Thunderstorms across northeast Iowa and southwest
    Wisconsin have congealed into a small mesoscale cluster. Although
    individual cells are moving generally east, general propagation of
    the overall cluster will be more south-southeast, into the
    instability axis that stretches from central Iowa northeast into
    southern Wisconsin.

    Southwest of this cluster, additional, more discrete, thunderstorms
    are developing within a weak confluent zone extending from southwest
    Iowa into northeast Iowa that is coincident with the previously
    mentioned instability axis.

    Within both regimes, thunderstorms may pose a brief hail and gusty
    wind threat, but the pending loss of diurnal heating and lack of
    large-scale ascent or deep-layer shear will result in an overall
    weakening trend the next few hours. A new watch will not be required
    south or east of existing WW 120.

    ..Marsh/Grams.. 05/25/2018

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

    ATTN...WFO...GRB...MKX...DVN...DLH...ARX...MPX...DMX...FSD...
    ABR...

    LAT...LON 44589717 45609388 46289221 45988891 43088946 42479088
    42699520 43449837 44589717



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, May 04, 2019 01:32:47
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    ACUS11 KWNS 040132
    SWOMCD
    SPC MCD 040132
    TXZ000-040230-

    Mesoscale Discussion 0523
    NWS Storm Prediction Center Norman OK
    0832 PM CDT Fri May 03 2019

    Areas affected...south central through south Texas

    Concerning...Severe Thunderstorm Watch 127...

    Valid 040132Z - 040230Z

    The severe weather threat for Severe Thunderstorm Watch 127
    continues.

    SUMMARY...Storms are expected to continue to pose a risk for
    isolated hail and damaging wind across the remainder of south
    central Texas within WW 127. Trends are being monitored for a
    possible downstream WW.

    DISCUSSION...A line of strong to severe storms continues southeast
    at 30-35 kt through south central TX. Some bowing segments and an
    occasional embedded supercell structure or two continue to be
    observed. The downstream atmosphere is moderately unstable with
    1500-2500 J/kg MLCAPE, but the 00Z CRP RAOB suggests convective
    inhibition will undergo some increase this evening as the surface
    layer cools. Despite this, sufficient organization within the line
    and an organized cold pool would indicate that convergence along the
    leading gust fronts might be sufficient to maintain the storms into
    portions of south through southeast Texas next few hours.

    ..Dial.. 05/04/2019

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

    ATTN...WFO...HGX...CRP...EWX...

    LAT...LON 28229896 28869703 30199648 30049581 29409562 28719606
    27779757 27609871 27869925 28229896



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