• MESO: Mesoscale Discussion 1037

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, July 11, 2018 04:21:00
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    ACUS11 KWNS 110420
    SWOMCD
    SPC MCD 110420
    NDZ000-110615-

    Mesoscale Discussion 1037
    NWS Storm Prediction Center Norman OK
    1120 PM CDT Tue Jul 10 2018

    Areas affected...Northern North Dakota

    Concerning...Severe Thunderstorm Watch 270...

    Valid 110420Z - 110615Z

    The severe weather threat for Severe Thunderstorm Watch 270
    continues.

    SUMMARY...A wind damage threat is likely to continue for few more
    hours as a line of storms moves eastward across northern North
    Dakota. A new weather watch could be needed as the line approaches
    the eastern edge of the WW 270 around 0600Z although the risk should
    remain spatially and temporally limited.

    DISCUSSION...A well-developed linear MCS is ongoing across northwest
    North Dakota, which is located along a gradient of moderate
    instability. The RAP is estimating MLCAPE values across northern
    North Dakota in the 1500 to 3000 J/kg range. The line of storms is
    being supported by the moderate instability and by large-scale
    ascent associated with a shortwave trough moving eastward through
    the northern Plains near the top of an upper-level ridge. The
    WSR-88D VWP in northern North Dakota shows 0-6 km shear near 40 kt
    with backed east-southeasterly surface winds and strongly veering
    winds with height in the lowest 2 Km AGL. This wind profile will
    support bowing line segments within the MCS over the next few hours.
    A forward speed of around 50 kt will make wind damage possible along
    the leading edge of the linear MCS.

    ..Broyles/Grams.. 07/11/2018

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

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

    LAT...LON 49200259 48740291 48240293 47960265 47910199 48119906
    49149914 49330026 49280168 49200259



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