• MESO: Mesoscale Discussion 1391

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Jul 29 20:27:44 2021
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    ACUS11 KWNS 292027
    SWOMCD
    SPC MCD 292026=20
    NJZ000-PAZ000-DEZ000-MDZ000-292200-

    Mesoscale Discussion 1391
    NWS Storm Prediction Center Norman OK
    0326 PM CDT Thu Jul 29 2021

    Areas affected...Southeastern PA...NJ...Northern VA...Central
    MD...Delmarva

    Concerning...Tornado Watch 401...

    Valid 292026Z - 292200Z

    The severe weather threat for Tornado Watch 401 continues.

    SUMMARY...Threat for damaging wind gusts and/or brief tornadoes will
    continue for the next few hours.

    DISCUSSION...A large area of showers and thunderstorms continues to
    move eastward across the northern Mid-Atlantic. Much of this
    activity has remained shallow and transient. However, a few more
    robust updrafts have been able to develop, including two which are
    currently ongoing over MD, one over Carroll County MD and the other
    over Howard County MD, and another over Lehigh County PA. Low to
    mid-level rotation has been noted in each one of these storms,
    suggesting the slightly stronger flow associated with this shortwave
    trough (sampled well by recent LWX VAD profiles) coupled with the
    southerly surface winds is enough to promote updraft rotation. This
    current trend of transient updrafts capable of damaging wind gusts
    and/or brief tornadoes will likely continue for the next few hours.

    ..Mosier.. 07/29/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!s3HpnHUX4HQzUcUVeh_st04T2gIF6hyYqdt8P8mlrdyJ5dWrJaKlf1X8Xi4pAgJKXJVBjYIQ$=
    for graphic product...

    ATTN...WFO...OKX...PHI...CTP...LWX...

    LAT...LON 40877596 41147542 40787442 39667467 38997507 38787661
    39347758 40167678 40877596=20



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