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  • MESO: Mesoscale Discussion 0020

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, January 18, 2019 18:08:17
    This is a multi-part message in MIME format...

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    ACUS11 KWNS 181708
    SWOMCD
    SPC MCD 181707
    IAZ000-MNZ000-SDZ000-182000-

    Mesoscale Discussion 0020
    NWS Storm Prediction Center Norman OK
    1107 AM CST Fri Jan 18 2019

    Areas affected...Eastern South Dakota...Southern Minnesota...and
    northern Iowa.

    Concerning...Heavy snow

    Valid 181707Z - 182000Z

    SUMMARY...A band of moderate to heavy snow has developed from
    Mitchell, SD to northeast Iowa with snowfall rates of 1 to 2 inches
    per hour. High snow to liquid ratios may lead to accumulation rates
    in excess of 2 inches per hour under the heaviest bands.

    DISCUSSION...A frontogenesis band continues to strengthen across
    eastern South Dakota, southern Minnesota, and northern Iowa. This
    band will slowly move east through the afternoon, but is likely near
    peak intensity at this time. A dendritic growth zone extending from
    the surface to around 15 kft based on RAP soundings will foster high
    snow to liquid ratios likely in excess of 20:1 in the heaviest snow
    bands. While the movement of this band will limit the total
    accumulations in some locations, there does appear to be a narrow
    swath a county or two wide which will stay under the heaviest
    snowfall rates for an extended period and may outperform
    expectations. The likely area with these locally higher amounts will
    be in the southern tier of counties in Minnesota west of I-35.

    ..Bentley.. 01/18/2019

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

    ATTN...WFO...ARX...MPX...DMX...FSD...

    LAT...LON 44289829 44369596 44129432 43649242 43339164 42899130
    42679158 42759300 42989469 43249580 43389666 43209727
    43189787 43379824 43989849 44289829



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