• MESO: Mesoscale Discussion 1540

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Aug 17 04:24:08 2021
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    ACUS11 KWNS 170424
    SWOMCD
    SPC MCD 170423=20
    AZZ000-170600-

    Mesoscale Discussion 1540
    NWS Storm Prediction Center Norman OK
    1123 PM CDT Mon Aug 16 2021

    Areas affected...Arizona

    Concerning...Severe Thunderstorm Watch 442...

    Valid 170423Z - 170600Z

    The severe weather threat for Severe Thunderstorm Watch 442
    continues.

    SUMMARY...Gusty winds are expected with a squall line as it
    propagates off the higher terrain.

    DISCUSSION...Weak mid-level vort is rotating south across
    northwestern NM late this evening. This feature may be partly
    responsible for loose organization of convection that has evolved
    from southern Coconino-Gila-northern Graham County over the higher
    terrain. Forward propagation is expected to continue in a
    southwesterly direction at roughly 25kt and if this movement
    continues would affect the eastern PHX metro perhaps as early as
    0630-07z. Gusty winds are the primary threat with this squall line.

    ..Darrow.. 08/17/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!v9xoiKMeWrUFF7BtCGoKk8KnMNZb4YGjtvI6u9leFxU4jl-IvhiU40gAXXCsMWG_92TbrGLj$=
    for graphic product...

    ATTN...WFO...TWC...FGZ...PSR...

    LAT...LON 34351169 33111046 32681099 32961181 34351169=20



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