• MESO: Mesoscale Discussion 1318

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Jul 20 00:05:06 2021
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    ACUS11 KWNS 200005
    SWOMCD
    SPC MCD 200004=20
    NDZ000-200200-

    Mesoscale Discussion 1318
    NWS Storm Prediction Center Norman OK
    0704 PM CDT Mon Jul 19 2021

    Areas affected...central and northern North Dakota

    Concerning...Severe potential...Watch unlikely=20

    Valid 200004Z - 200200Z

    Probability of Watch Issuance...20 percent

    SUMMARY...A localized severe threat is expected to persist for a
    couple of hours with storms near a differential heating zone. Large
    hail and damaging gusts are the main threat. A WW issuance is not
    expected given the brevity/localized nature of the severe threat.

    DISCUSSION...Multiple storms have intensified across portions of
    central into northern ND over the past hour or so, with a supercell
    in progress across McHenry County. MRMS MESH suggests that
    significant (2+ inch) hail is occurring with this supercell storm,
    with the public also reporting 2 inch diameter hailstones within the
    past hour. This storm is currently traversing a baroclinic zone,
    with warmer but drier air (90s F surface temperatures over 60F
    dewpoints) to the south, but moister air (upper 60s to 70 F
    dewpoints) to the north. 12Z mesoanalysis shows up to 2500 J/kg
    MLCAPE and 40 kts of effective bulk shear present along and north of
    the boundary, supporting continued severe with the ongoing storms.
    2+ inch hailstones and damaging gusts (some potentially reaching 60
    kts) will be possible with the ongoing supercell. To the northeast,
    severe hail and wind may also occur with an intensifying storm
    complex in Towner County, ND, and significant severe hail/wind
    cannot be ruled out with these storms as well, so long as MLCINH
    remains minimal.

    MLCINH is expected to quickly increase with nocturnal cooling in a
    few hours, which should contribute to waning severe potential. Given
    the localized, short-duration nature of the severe threat, a WW
    issuance is not anticipated.

    ..Squitieri/Edwards.. 07/20/2021

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!sPr5W2nhNv_e3KW9jVPFGl1JMxw8F1C4YWAZ7Y_XhYxI8jJFNizcaBTOhzzSdrpaIwhtgf3_$=
    for graphic product...

    ATTN...WFO...FGF...BIS...

    LAT...LON 47350104 47560149 47850166 48400125 48790057 49049990
    49109933 49089848 48939792 48659758 48299737 47989735
    47689755 47409838 47289938 47350104=20



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