• MESO: Mesoscale Discussion 0428

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, April 06, 2022 20:45:24
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    ACUS11 KWNS 062043
    SWOMCD
    SPC MCD 062043=20
    TNZ000-VAZ000-KYZ000-NCZ000-GAZ000-ALZ000-062145-

    Mesoscale Discussion 0428
    NWS Storm Prediction Center Norman OK
    0343 PM CDT Wed Apr 06 2022

    Areas affected...portions of northeast Alabama into far northwest Georgia...eastern Tennessee...and extreme southeast Kentucky

    Concerning...Severe potential...Watch likely=20

    Valid 062043Z - 062145Z

    Probability of Watch Issuance...80 percent

    SUMMARY...A severe threat may develop with storms that initiate
    along a cold front, posing a threat for damaging gusts. A couple
    instances of severe hail/tornadoes are also possible.

    DISCUSSION...Storms have struggled to develop within the warm sector environment 50-150 nautical miles ahead of the cold front despite
    ample diurnal heating and the presence of adequate buoyancy.
    However, storms have been developing along and immediately behind
    the cold front over the past hour. An uptick in storm coverage and
    intensity is possible over the next few hours as the cold front
    continues to progress eastward. The 500-1500 J/kg MLCAPE, driven by
    60-65 F surface dewpoints and steep low-level lapse rates, along
    with 40+ kts of effective bulk shear suggest that damaging gusts may
    be the main threat with the more organized multicells/transient
    supercells that can develop. However, a few surface observations
    along a CHA to CPF line show some backing of the surface winds. Any
    storms that can mature amid these back winds may exhibit at least
    brief bouts of strong low-level rotation, with severe hail and a
    couple of tornadoes possible.

    ..Squitieri/Mosier.. 04/06/2022

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!sHTY-FeaNGWWnGnAAG9Y42CED54goa-9leefKHHt2JWhP8_DiOrgG-DV6S-isWozYUV1Ua_h$=
    for graphic product...

    ATTN...WFO...GSP...MRX...JKL...FFC...LMK...OHX...BMX...HUN...

    LAT...LON 34438741 36278538 36958480 36998447 36958373 36728312
    36028301 35598350 35168407 34668452 34358525 34228613
    34438741=20



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, April 01, 2023 15:16:07
    ACUS11 KWNS 011516
    SWOMCD
    SPC MCD 011515=20
    PAZ000-NYZ000-WVZ000-OHZ000-011745-

    Mesoscale Discussion 0428
    NWS Storm Prediction Center Norman OK
    1015 AM CDT Sat Apr 01 2023

    Areas affected...eastern Ohio into western Pennsylvania and New York

    Concerning...Severe potential...Watch likely=20

    Valid 011515Z - 011745Z

    Probability of Watch Issuance...95 percent

    SUMMARY...Storms producing damaging winds appear increasingly likely
    today, beginning over eastern Ohio and moving quickly into parts of
    New York and Pennsylvania.

    DISCUSSION...Satellite imagery shows strong heating occurring over
    the region, with storms beginning to form ahead of the cold
    front/vort max. Despite low dewpoints, very steep deep-layer lapse
    rates, strong shear and substantial mixing of high winds aloft will
    likely yield wind gusts in excess of 50 kt over much of the area. As
    such, a watch is likely, and the outlook will feature a 30% severe
    wind probability.

    ..Jewell/Guyer.. 04/01/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!94gDdbLELaj6lRbDtqPLmmhd0yEKD5VIXuDxSYySggTL5iramdR8zIN1q04WxYGgskxIch9Sm= XJzxYfxnkEdTReK8KQ$ for graphic product...

    ATTN...WFO...BGM...BUF...CTP...PBZ...CLE...

    LAT...LON 43167875 43167804 43067780 42597752 41447750 40697783
    39917843 39738036 39688131 39858173 40088179 40698195
    41388197 42038161 43127903 43167875=20


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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, April 12, 2024 04:15:41
    ACUS11 KWNS 120415
    SWOMCD
    SPC MCD 120415=20
    VAZ000-MDZ000-DCZ000-120615-

    Mesoscale Discussion 0428
    NWS Storm Prediction Center Norman OK
    1115 PM CDT Thu Apr 11 2024

    Areas affected...Eastern Virginia...Southern Maryland

    Concerning...Tornado Watch 107...

    Valid 120415Z - 120615Z

    The severe weather threat for Tornado Watch 107 continues.

    SUMMARY...An isolated wind damage and tornado threat will likely
    continue for a few more hours across eastern Virginia. The threat
    may eventually affect southern Maryland, but the need for another
    watch is unclear.

    DISCUSSION...An upper-level trough and an associated 80 to 100 knot
    mid-level jet, will move through Carolinas early tonight. Ahead of
    the trough, a 60 to 70 knot low-level jet will continue from eastern
    North Carolina into eastern Virginia and southern Maryland. A line
    of strong to severe thunderstorms, ongoing to the northwest of
    Wakefield, Virginia, will move eastward toward the low-level jet
    over the next couple of hours. RAP forecast soundings across eastern
    Virginia from 05Z to 06Z have 0-6 km shear near 60 knots, and 0-3 km storm-relative helicity in the 250 to 350 m2/s2 range. This
    environment will support an isolated tornado and wind-damage threat
    with low-topped supercells, however recent trends suggest that the
    cloud tops have warmed, and lightning flash rates have come down.
    Although the severe threat should spread northeastward into southern
    Maryland early tonight, the threat should be marginal.

    ..Broyles.. 04/12/2024

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!_stozEwWGYm8bLAGcFnmwYAJjB09XTaWZ3MnwCzYHRs3kaSagjqFKESKPP8jWHmtQN_7rMNea= RdJ5eIthuqyPRo8ilU$ for graphic product...

    ATTN...WFO...PHI...AKQ...LWX...

    LAT...LON 38477588 38867634 38967685 38937731 38527775 37867777
    37267765 37037736 36977682 37237608 37697583 38477588=20


    =3D =3D =3D
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