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  • MESO: Mesoscale Discussion 0242

    From COD Weather Processor@1:2320/107 to wx-storm@lists.illinois.edu on Sun Mar 15 14:50:12 2026
    ACUS11 KWNS 151450
    SWOMCD
    SPC MCD 151449=20
    MNZ000-IAZ000-NEZ000-SDZ000-152045-

    Mesoscale Discussion 0242
    NWS Storm Prediction Center Norman OK
    0949 AM CDT Sun Mar 15 2026

    Areas affected...portions of South Dakota...southern Minnesota...far
    northeast Nebraska...and northwest Iowa

    Concerning...Blizzard=20

    Valid 151449Z - 152045Z

    SUMMARY...Low-level wind fields are expected to intensify through
    much of the morning over the northern Plains and upper Midwest. The
    strong winds, along with ongoing snowfall, will likely support the
    development and expansion of blizzard conditions through the day.

    DISCUSSION...Morning surface and radar analysis showed a deep
    surface cyclone (990 mb) quickly intensifying as it moves
    northeastward across portions of northern MO. Supported by intense
    height falls and ascent from a deep upper trough, very strong
    northerly low-level winds were observed over much of the Great
    Plains and upper Midwest behind the surface cyclone and a trailing
    cold front.

    Light snowfall remains ongoing over parts of eastern SD, NE and
    western MN. This band of snow, likely associated with mid-level ascent/deformation beneath the upper trough will gradually expand in
    coverage to the east/southeast into parts of IA. Despite limited
    snowfall rates, very strong boundary-layer winds (50-60 kt below 1
    km) are being observed with a northerly low-level jet max. These
    strong surface gusts and antecedent snow depth should be sufficient
    to support substantial blowing snow. Low visibilities have begun to
    develop over parts of SD, and widespread visibility reductions to
    1/2 - 1/4 mile are forecast to support a hybrid combination of
    ground blizzard and blowing snow conditions this morning and through
    much of today.

    Later today into this afternoon, the strong winds and blowing snow
    should expand across parts of IA. It may take several hours for
    sufficient snowfall and depth to accumulate and support lower
    visibilities. However, given the expected increase in snowfall and
    surface gusts upwards of 60 mph, significant visibility reductions
    and travel impacts are expected later today into tonight.

    ..Lyons.. 03/15/2026

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!-Du3nDOZ_b6GwiMjYiGYPQkutlJps7lS2twxxcpGcl6fygXS0nLfxr6qX4swSLNCwgqvN5u7T= WmZo1w2TzzEmUsuTS8$ for graphic product...

    ATTN...WFO...ARX...MPX...DMX...FGF...FSD...OAX...ABR...UNR...

    LAT...LON 41309484 41419573 42089689 42619777 43319902 43810029
    44530079 45580058 45799931 45719479 45259333 44529286
    43319304 42639314 42019354 41529387 41309484=20


    =3D =3D =3D
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