• MESO: Mesoscale Discussion 0041

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jan 11 18:53:18 2023
    ACUS11 KWNS 111853
    SWOMCD
    SPC MCD 111852=20
    NEZ000-COZ000-WYZ000-112145-

    Mesoscale Discussion 0041
    NWS Storm Prediction Center Norman OK
    1252 PM CST Wed Jan 11 2023

    Areas affected...southern Nebraska Panhandle and Northeastern
    Colorado

    Concerning...Heavy snow=20

    Valid 111852Z - 112145Z

    SUMMARY...A band of heavy snow will continue to shift eastward
    across the Nebraska Panhandle southward into northeastern Colorado.
    Snowfall rates of 1-2"/hr will be possible.

    DISCUSSION...A band of heavy snow has been ongoing across eastern
    Wyoming this afternoon and continues to shift eastward across the
    Nebraska Panhandle into northeastern Colorado. Surface objective
    analysis and RAP model sounding indicate mid-level lapse rates
    around 7 C/km coinciding with deep saturation of the dendritic
    growth zone across much of the region from northeast Colorado into
    the southern Nebraska Panhandle. This will support snowfall rates of
    1-2"/hr. Surface observations have indicated areas of heavy snow
    with <1/4 visibility across I-80 in Nebraska. Expect quick
    accumulation and hazardous driving conditions due to low visibility
    and accumulating snow on roadways.

    ..Thornton.. 01/11/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!_mHOBlaTL7hVrt5FXs7N7gzRu34V2Zul8in06_0-Nza_FFdDBC8LXU7CSKsyLL0AAEzDOxnmj= uHMgtoN5p312Di_eQo$ for graphic product...

    ATTN...WFO...LBF...GLD...PUB...BOU...CYS...

    LAT...LON 41080464 41550441 41970399 42030344 41860303 41580270
    41280262 40920251 40330260 39820272 39320304 38890350
    38770406 38910450 39440466 41080464=20


    =3D =3D =3D
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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Jan 10 00:25:46 2024
    ACUS11 KWNS 100025
    SWOMCD
    SPC MCD 100025=20
    NCZ000-VAZ000-100200-

    Mesoscale Discussion 0041
    NWS Storm Prediction Center Norman OK
    0625 PM CST Tue Jan 09 2024

    Areas affected...Middle Atlantic

    Concerning...Tornado Watch 7...

    Valid 100025Z - 100200Z

    The severe weather threat for Tornado Watch 7 continues.

    SUMMARY...Gusty winds, along with the threat for brief tornadoes,
    are expected with convection this evening.

    DISCUSSION...Strong, large-scale forcing is spreading across the
    middle Atlantic early this evening ahead of an approaching trough.
    An expansive corridor of pre-frontal convection has developed in
    response to this forcing, currently extending from southeast VA,
    south across the eastern Carolinas. Surface dew points will struggle
    to rise above 63-65F across the warm sector which is limiting
    instability within a poor lapse rate environment. Latest diagnostic
    data suggests the only meaningful buoyancy is located across
    southeast NC where MLCAPE is on the order of 500 J/kg; although,
    offshore buoyancy is likely considerably higher (in excess of 1000
    J/kg). Radar data supports this with strong, long-lived rotating
    updrafts noted about 50 mi offshore. These supercells are advancing
    northeast, but have weakened a bit as they spread inland where
    buoyancy is weaker. Even so, strong shear is expected to maintain
    these updrafts as they track across the eastern portions of NC this
    evening. Damaging gusts can be expected with the organized
    convection and some risk for brief tornadoes continue, especially
    with the supercells near the higher buoyancy.

    ..Darrow.. 01/10/2024

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!84POZXHWCudZ79ScTjOIUMJIzSxaLtxF97ak-kneM4fmQUkiC2uSTA-IFgorcCtNF60tG_0lH= -cbjgv_PScTGMt9fBs$ for graphic product...

    ATTN...WFO...AKQ...MHX...RAH...ILM...

    LAT...LON 34027805 36837747 36547554 34627607 34027805=20


    =3D =3D =3D
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