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  • MESO: Mesoscale Discussion 1339

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tuesday, August 21, 2018 23:07:13
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    ACUS11 KWNS 212307
    SWOMCD
    SPC MCD 212306
    PAZ000-DEZ000-MDZ000-DCZ000-VAZ000-WVZ000-220030-

    Mesoscale Discussion 1339
    NWS Storm Prediction Center Norman OK
    0606 PM CDT Tue Aug 21 2018

    Areas affected...southeast PA...the WV Panhandle...northern VA...and
    parts of MD

    Concerning...Severe Thunderstorm Watch 346...

    Valid 212306Z - 220030Z

    The severe weather threat for Severe Thunderstorm Watch 346
    continues.

    SUMMARY...An isolated strong, locally damaging wind gust is
    possible, mainly across far northern VA into northern MD the next
    hour or so. Otherwise, severe threat is expected to quickly diminish
    this evening.

    DISCUSSION...Convection across the region has generally been
    sub-severe late this afternoon and weakening is expected into the
    evening hours. Some stronger cells were evident across northern MD,
    likely tapping into a local maximum in instability and shear. Some
    strong to damaging wind gusts will continue to be possible with this
    bowing segment the next hour or so. However, poor lapse rates,
    quickly decreasing low-level shear and loss of daytime heating
    leading to an increasingly stabilizing boundary-layer will limit
    persistence of near-severe level storms. Given expected trends, a
    downstream watch is not expected.

    ..Leitman.. 08/21/2018

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

    ATTN...WFO...PHI...CTP...LWX...PBZ...RLX...

    LAT...LON 39587904 39657828 39817796 40347766 40647736 40727681
    40527577 39997558 39037607 38507693 38287823 38367922
    38737949 39587904



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