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  • MESO: Mesoscale Discussion 0521

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, May 25, 2018 22:21:14
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    ACUS11 KWNS 252221
    SWOMCD
    SPC MCD 252220
    WIZ000-IAZ000-MNZ000-SDZ000-260015-

    Mesoscale Discussion 0521
    NWS Storm Prediction Center Norman OK
    0520 PM CDT Fri May 25 2018

    Areas affected...far eastern South Dakota...southern and central Minnesota...western and central Wisconsin...and far northern Iowa

    Concerning...Severe Thunderstorm Watch 120...

    Valid 252220Z - 260015Z

    The severe weather threat for Severe Thunderstorm Watch 120
    continues.

    SUMMARY...Thunderstorms continue within a moist, unstable
    environment. Isolated hail and gusty thunderstorm winds will be
    possible for another few hours before thunderstorms weaken after
    sunset.

    DISCUSSION...Thunderstorms continue throughout the region within a
    moist, weakly-capped environment. GOES-EAST 1-minute visible imagery
    suggest that occasionally strong updraft pulses are occurring, but
    are not being sustained for any significant duration. These strong
    updraft pulses are likely stemming from most-unstable CAPE values
    ranging from a 1200 J/kg across southwest Minnesota up to around
    2500 J/kg across portions of western Wisconsin (in and near Severe
    Thunderstorm Watch #120). However, deep-layer shear is generally
    less than 30 knots across much of the region, which is likely
    contributing to the inability of any sustained intense updrafts.
    Although large hail and gusty thunderstorm winds will be possible
    with the stronger updraft pulses (especially in and near WW 120),
    the overall lack of sufficient deep-layer shear will act to broadly
    limit thunderstorm organization/maturation and preclude a more
    robust, widespread severe threat.

    ..Marsh.. 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 Friday, May 03, 2019 23:48:47
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    ACUS11 KWNS 032348
    SWOMCD
    SPC MCD 032348
    TXZ000-040045-

    Mesoscale Discussion 0521
    NWS Storm Prediction Center Norman OK
    0648 PM CDT Fri May 03 2019

    Areas affected...south central Texas

    Concerning...Severe Thunderstorm Watch 127...

    Valid 032348Z - 040045Z

    The severe weather threat for Severe Thunderstorm Watch 127
    continues.

    SUMMARY...Storms will remain capable of producing damaging wind and
    large hail over south central Texas through the evening.

    DISCUSSION...Early this evening numerous storms persist over south
    central Texas from Austin to near Del Rio. Storms remain within an
    environment characterized by moderate instability and effective bulk
    shear from 35-45 kt, but low-level hodographs are small. This
    environment will continue to support some supercell structures, but
    numerous storm mergers are occurring and an upscale linear growth
    appears to be in progress. The cap is relatively weak in the
    downstream warm sector, and storms will continue to forward
    propagate as the cold pools consolidate. Both damaging wind and
    large hail remain likely, but damaging wind may become the dominant
    threat as storms evolve into a linear mode.

    ..Dial.. 05/03/2019

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

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

    LAT...LON 29640043 30089893 30569775 30369685 29439678 28619797
    28830030 29640043



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