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  • MESO: Mesoscale Discussion 0061

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sat Jan 13 20:06:08 2024
    ACUS11 KWNS 132006
    SWOMCD
    SPC MCD 132005=20
    ORZ000-WAZ000-140000-

    Mesoscale Discussion 0061
    NWS Storm Prediction Center Norman OK
    0205 PM CST Sat Jan 13 2024

    Areas affected...Northwestern Oregon and far southeastern Washington

    Concerning...Heavy snow=20

    Valid 132005Z - 140000Z

    SUMMARY...Periods of heavy snow with snowfall rates between 1-2
    in/hour will continue into the mid/late afternoon hours. Freezing
    rain remains probable through the Willamette Valley.

    DISCUSSION...Bands of moderate to heavy precipitation continue to
    overspread the Pacific Northwest ahead of an approaching mid-level
    wave. So far, much of this activity has been driven by warm
    advection in the 850-700 mb layer, but some uptick in precip
    coverage and intensity appears likely as lift associated with the
    vorticity maximum and attendant mid-level jet overspreads the
    region. The 18z SLE sounding sampled a deep saturated layer from the
    surface to around 450 mb with a somewhat shallow (~100 mb deep) 1-2
    C warm nose centered at about 850 mb/3 kft. More recent KRTX CC
    imagery indicates that this warm nose remains in place. Locations
    above roughly 3 kft should continue to see moderate to heavy
    snowfall through the mid/late afternoon with snowfall rates between
    1-2 in/hour possible. The shallow sub-freezing layer below ~3 kft
    will support a continuation of freezing rain for some locations -
    primarily through the Willamette Valley. However, localized
    fluctuations in the shallow warm layer may promote variation in
    precipitation types between freezing rain, snow, and sleet.

    ..Moore.. 01/13/2024

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!_x1LngDVxE5cXe1XVznRk6pY4ntY8lyfFk3Su4pwexY1NF0fRDDzGvipuc7DPXB-S4TEnt3iw= 6XUThn-gpEGOAc1jIs$ for graphic product...

    ATTN...WFO...PDT...MFR...SEW...PQR...

    LAT...LON 44192375 44442423 44642418 46032410 46212399 46392363
    46352107 46182067 45762021 45001991 44212004 43732038
    43532087 43462157 43772338 44192375=20


    =3D =3D =3D
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