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  • MESO: Mesoscale Discussion 0133

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Tue Mar 4 16:26:05 2025
    ACUS11 KWNS 041626
    SWOMCD
    SPC MCD 041625=20
    MNZ000-SDZ000-NEZ000-042030-

    Mesoscale Discussion 0133
    NWS Storm Prediction Center Norman OK
    1025 AM CST Tue Mar 04 2025

    Areas affected...Eastern South Dakota into far southwestern
    Minnesota and far northern Nebraska

    Concerning...Heavy snow=20

    Valid 041625Z - 042030Z

    SUMMARY...Localized moderate to heavy snowfall rates on the order of
    1-2 inches/hour will be possible as snow bands develop across
    eastern South Dakota into far western Minnesota and far northern
    Nebraska.

    DISCUSSION...Transient snow banding has been observed across eastern
    SD into northern NE over the past couple of hours with surface
    observations and web cams under these bands showing localized areas
    of visibility reductions down to 1/4 to 1/2 mile. These bands are
    largely being driven by focused ascent within a 700 mb deformation
    zone augmented by modest warm advection/frontogenesis through the
    850-700 mb layer. Additionally, steep lapse rates within this zone
    are supporting localized areas of convectively-augmented
    precipitation rates (as evidenced by recent lightning strikes over
    the SD/NE/IA border). This deformation zone will continue to be a
    preferential area of transient precipitation band development
    through the late morning and early afternoon hours. Areas to the north/northwest of the surface freezing line may experience periods
    of moderate to heavy snowfall rates (1-2 inches/hour) as transient
    snow bands emerge. Given surface gradient winds sustained at 20-25
    mph (gusting to 30-40 mph at times), localized areas of whiteout
    conditions (visibility below 1/4 mile) appear possible under more
    organized bands.

    ..Moore.. 03/04/2025

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!9GFlZ5JYWiWpfdNdfRiuwj99in95JqSoHEhWIVPpOJYY0e63qA6m9VzU3WYnIjqVeXOFJ0DnL= aWR9-KKJBap0jMPzo4$ for graphic product...

    ATTN...WFO...MPX...FGF...FSD...ABR...LBF...UNR...

    LAT...LON 44529661 43949746 43539787 43049832 42509879 42229916
    42159944 42129978 42260007 42520015 42810014 44979804
    45249776 45479742 45689693 45789655 45809614 45739572
    45589560 45419567 45309580 45109603 44929625 44529661=20


    =3D =3D =3D
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