• MESO: Mesoscale Discussion 0474

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, April 13, 2022 15:50:16
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    ACUS11 KWNS 131549
    SWOMCD
    SPC MCD 131549=20
    ILZ000-MOZ000-ARZ000-131645-

    Mesoscale Discussion 0474
    NWS Storm Prediction Center Norman OK
    1049 AM CDT Wed Apr 13 2022

    Areas affected...portions of far northern AR...southern MO...and
    southern IL

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

    Valid 131549Z - 131645Z

    Probability of Watch Issuance...80 percent

    SUMMARY...Severe potential is increasing ahead of a developing QLCS
    across southern MO into northern AR. A watch likely will be needed
    soon downstream of this line of storms from southern MO into
    southern IL and perhaps parts of northern AR.

    DISCUSSION...A line of storms from south-central MO into far
    north-central AR has increased in intensity and organization over
    the past hour or so. While the downstream airmass continues to
    recover from overnight/morning convection and instability remains
    weak, a modest cold pool is likely aiding in better organization of
    the developing QLCS. Some additional airmass recovery downstream of
    the eastward-advancing line of storms is expected, and overall shear
    profiles will support sustained organized convection.=20

    Southwesterly flow increases rapidly with height across the MCD
    area, with 850 mb winds near or greater than 50 kt. If stronger cold
    pool development continues, a developing rear-inflow jet could
    increase potential for more widespread damaging gusts. While
    damaging wind potential appears to be the greater threat with this
    activity, effective SRH near 200 m2/s2 amid favorable low-level
    speed shear also will support a few mesovortex tornadoes within the
    QLCS. A watch may be needed soon for portions of the MCD area.

    ..Leitman/Thompson.. 04/13/2022

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!oXtzy6olF6bO47pazLadti3mPnQSyae8PMjIRGtGPhSAUudqpVK77r_kzTMnUG65JJ_Ghspr$=
    for graphic product...

    ATTN...WFO...PAH...LSX...LZK...SGF...

    LAT...LON 36379301 37149269 37809232 38169158 38439089 38549008
    38528983 38438926 38198882 37878862 37598862 37368880
    37038953 36639073 36249165 36039217 36029261 36189296
    36379301=20



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, April 05, 2023 05:57:08
    ACUS11 KWNS 050557
    SWOMCD
    SPC MCD 050556=20
    MOZ000-ARZ000-050730-

    Mesoscale Discussion 0474
    NWS Storm Prediction Center Norman OK
    1256 AM CDT Wed Apr 05 2023

    Areas affected...west-central AR into northern AR...southern MO

    Concerning...Severe potential...Watch possible=20

    Valid 050556Z - 050730Z

    Probability of Watch Issuance...60 percent

    SUMMARY...Storm development over west-central and north-central AR
    is being monitored for the possibility of further intensification.=20
    A tornado watch is possible.

    DISCUSSION...Radar/lightning network data during the 1200-1255am
    period has shown storm development over west-central and
    north-central AR. This corridor from west-central AR northeastward
    into southern MO is located within a broad, moist conveyer with a
    60-kt south-southwesterly LLJ over the Mid South/Ozarks into the mid
    MS Valley. The latest RAP forecast soundings show a residual
    capping inversion, and it is unclear how widespread the developing
    thunderstorm activity will be through the overnight. However, the
    latest storm-scale trends over west-central AR show the development
    of a more persistent/intensifying updraft (echo tops 45-50 kft).=20
    The KLZK VAD shows a large looping low-level hodograph with a slight
    weakness around 3km ARL, and strengthening flow into the mid and
    upper levels. As a result of the moist and moderately buoyant
    airmass, if updrafts can root into the boundary layer, the
    probability of a supercell and a supercell-tornado threat will
    likely develop. Convective trends will be monitored in the short
    term for the possibility for a tornado watch.

    ..Smith/Edwards.. 04/05/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!4Onuj7kFct2aBo7Ga4vOk7BDkyRJE9UGlBrnrTGMX_8OjDxT8KAFhO3pb_KkOcswWBD32S4do= 28G-IaMLd48saOJG7Q$ for graphic product...

    ATTN...WFO...PAH...MEG...LSX...LZK...SGF...

    LAT...LON 34429386 34729396 37369166 37549094 37509050 37219000
    36858984 34729098 34519123 34429150 34329355 34429386=20


    =3D =3D =3D
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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, April 17, 2024 19:44:36
    ACUS11 KWNS 171944
    SWOMCD
    SPC MCD 171944=20
    OHZ000-172115-

    Mesoscale Discussion 0474
    NWS Storm Prediction Center Norman OK
    0244 PM CDT Wed Apr 17 2024

    Areas affected...portions of western and north-central OH

    Concerning...Tornado Watch 122...

    Valid 171944Z - 172115Z

    The severe weather threat for Tornado Watch 122 continues.

    SUMMARY...All-hazards severe potential is increasing across parts of
    western into north-central Ohio the next 1-2 hours.

    DISCUSSION...Supercell thunderstorms roughly from Miami County to
    Wyandot County have intensified over the past hour. Radar data shows strengthening cores in 7 km CAPPI analysis while storm relative
    velocity data shows strengthening of mid and low-level mesocyclones. Furthermore, MRMS MESH has increased on a few thunderstorm cores
    with at least one TBSS noted. The 17z ILN RAOB showed favorable
    parameters for continued supercells storm mode with a risk of all
    severe hazards expected. An increased risk for tornadoes is expected
    with the activity over the next 1-2 hours.

    ..Leitman.. 04/17/2024

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!65RIpnS2azwu6vQoAgOGkuCcsOHj6BctP6uqog-lh8EodD1vtTIf9XFB1kdKsi24nE93xQITY= iR_1CZKGGVciwt3NNM$ for graphic product...

    ATTN...WFO...CLE...ILN...

    LAT...LON 41038336 41038253 40578217 40138249 39898320 39878379
    39888433 40038455 40468387 41038336=20


    =3D =3D =3D
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