• MESO: Mesoscale Discussion 2062

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thu Dec 22 17:00:15 2022
    ACUS11 KWNS 221700
    SWOMCD
    SPC MCD 221659=20
    ILZ000-MOZ000-IAZ000-222100-

    Mesoscale Discussion 2062
    NWS Storm Prediction Center Norman OK
    1059 AM CST Thu Dec 22 2022

    Areas affected...Eastern Missouri to western Illinois

    Concerning...Snow Squall=20

    Valid 221659Z - 222100Z

    SUMMARY...Sporadic, short-lived blizzard/snow squall conditions will
    be possible under a mesoscale snow band as it tracks east across
    parts of eastern Missouri and western Illinois through early/mid
    afternoon.

    DISCUSSION...Recent surface observations from far eastern IA show
    visibility reductions down to 1/4 mile at times under a persistent,
    though loosely organized, snow band. Based on latest RAP
    mesoanalysis, this band is primarily being driven by broad scale
    ascent ahead of a deepening upper low over the central Plains,
    augmented by more focused frontogenetical lift within the 850-700 mb
    layer. Forecast soundings indicate that much of this lift coincides
    with a 100-150 mb deep dendritic growth zone, which is likely
    yielding moderate, to at times heavy, snowfall rates up to 1
    inch/hour. Concurrently, strong cold advection behind the surface
    front is supporting frequent wind gusts between 25-35 knots from
    eastern IA to central MO. The combination of these winds and
    moderate snowfall rates will likely result in periods of
    blizzard/snow squall conditions with visibility reductions briefly
    falling to 1/4 mile under the snow band as it continues moving east
    through early/mid afternoon.

    ..Moore.. 12/22/2022

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!5aTps8SDTOeZmCWxuj3rYrcIDvWxPNZEG43VSdm1JhWe85V74znffsjvHcuLy_iwQBr9EhryF= DPcRPH5LHAUO01y7Gw$ for graphic product...

    ATTN...WFO...LOT...ILX...LSX...DVN...SGF...EAX...

    LAT...LON 39969175 41699077 42249007 42128917 41658861 40958810
    40208837 38978904 38298989 37559125 37559200 38439313
    38789294 39259244 39969175=20


    =3D =3D =3D
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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Aug 30 05:11:04 2023
    ACUS11 KWNS 300511
    SWOMCD
    SPC MCD 300510=20
    FLZ000-300615-

    Mesoscale Discussion 2062
    NWS Storm Prediction Center Norman OK
    1210 AM CDT Wed Aug 30 2023

    Areas affected...Western and Northern Portions of the Florida
    Peninsula

    Concerning...Tornado Watch 660...

    Valid 300510Z - 300615Z

    The severe weather threat for Tornado Watch 660 continues.

    SUMMARY...The tornado threat will continue along the west coast of
    Florida into the overnight hours, expanding north-northeastward into
    northern parts of the Florida Peninsula.

    DISCUSSION...Hurricane Idalia continues to move north-northeastward
    across the eastern Gulf of Mexico, and it is forecast by the
    National Hurricane Center to make landfall tonight. Parts of the
    outer rainbands of Idalia are currently located across the western
    Florida Peninsula, where strong low-level shear is present. The
    Tampa Bay WSR-88D VWP continues to show 0-3 storm-relative
    helicities above 400 m2/s2. As Idalia moves further
    north-northeastward, strong low-level shear is forecast to develop
    across northern Florida early tonight. This will make conditions
    favorable for tornadoes within the more discrete elements of the
    outer rainbands.

    ..Broyles.. 08/30/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!8Ss2RB_GWolIkqOg-sraZp1aqyfK00xsrIMtGMClHng0bGk3jZMo7UlEa36lgOoCTftBsToz7= Xy9kJMMKHOmEz3oxa8$ for graphic product...

    ATTN...WFO...MLB...TBW...JAX...TAE...

    LAT...LON 27668148 29678190 30308237 30388281 30318319 30008350
    29658355 29218328 28738300 27858296 27388283 27058243
    27038164 27548145 27668148=20


    =3D =3D =3D
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