• MESO: Mesoscale Discussion 1253

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sun Jul 11 04:56:38 2021
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    ACUS11 KWNS 110456
    SPC MCD 110456=20

    Mesoscale Discussion 1253
    NWS Storm Prediction Center Norman OK
    1156 PM CDT Sat Jul 10 2021

    Areas affected...Southern OK...Far Northwest/North-Central TX

    Concerning...Severe Thunderstorm Watch 368...370...

    Valid 110456Z - 110630Z

    The severe weather threat for Severe Thunderstorm Watch 368, 370

    SUMMARY...Strong, damaging wind gusts will likely continue for the
    next few hours.

    DISCUSSION...Western portion of the ongoing convective line has
    recently surged more southwestward towards a pocket of greater
    instability. This surge coincided with storm development briefly
    preceding the outflow before it was then overrun by the outflow.
    This merger appears to have allowed the updrafts to become more
    colocated with the outflow, strengthening the overall structure of
    the line and making damaging wind gusts more likely. A 53 kt wind
    gusts was reported about an hour ago in Chickasha. The more
    southwestward storm motion will likely keep this line in Severe
    Thunderstorm Watch 368 past its original expiration time of 0500Z.

    Portion of this line moving through Pontotoc and into John and Coal
    Counties has shown a bit more southeastward motion. KTLX velocity
    data also shows an area stronger outflow, which looks to be related
    to interaction with another outflow boundary from antecedent storms
    to the east.=20

    Airmass downstream of this line is moist and unstable, suggesting
    the line should continue for at least the next several hours,
    despite low-level nocturnal stabilization. The more southeastward
    motion of the central portion of the line may result in the need to
    expand Severe Thunderstorm Watch 370 eastward along the Red River in

    ..Mosier.. 07/11/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!vc3PpDBBIR8C-g2NpU7U0zbxcBaq-srWZjjPFhWzePcbYaQDLsI_9esxwwDGbfeF-mDrS7bU$=
    for graphic product...


    LAT...LON 34689975 35009919 34759591 34099534 33659592 33579679
    33609779 33699893 33909959 34199984 34689975=20

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