• MESO: Mesoscale Discussion 0385

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Friday, April 01, 2022 20:21:26
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    ACUS11 KWNS 012021
    SWOMCD
    SPC MCD 012020=20
    OKZ000-TXZ000-NMZ000-012145-

    Mesoscale Discussion 0385
    NWS Storm Prediction Center Norman OK
    0320 PM CDT Fri Apr 01 2022

    Areas affected...Texas Panhandle vicinity into southwestern Oklahoma
    and adjacent western North Texas

    Concerning...Severe potential...Watch unlikely=20

    Valid 012020Z - 012145Z

    Probability of Watch Issuance...20 percent

    SUMMARY...High-based convection may pose local risk for brief/strong
    outflow gusts, but WW issuance is not anticipated due to sparse
    nature of the threat anticipated over the next couple of hours.

    DISCUSSION...Surface dewpoints have risen into the 30s across the
    Texas Panhandle/Oklahoma vicinity within southerly flow ahead of a
    weak low over the northwestern Panhandle. This low -- associated
    with a rather vigorous/mobile short-wave trough crossing the
    southern Rockies at this time -- is focusing low-level ascent, and
    with the low-level moistening beneath steepening lapse rates aloft,
    the ascent has combined with very modest destabilization to support
    isolated, high-based convective development.=20=20

    With filtered heating through broken cloud cover to continue,
    modest/additional destabilization will continue through peak heating
    despite the meager boundary-layer moisture. Deeply-mixed, inverted
    V-type thermodynamic profiles -- as depicted in model point-forecast
    soundings -- are similar to typical localized strong wind gust
    events which occur over the West in the warm season, but in this
    case displaced eastward onto the high Plains. As such, similar to
    those western events, very localized potential for strong,
    evaporatively driven wind gusts would exist under any of the
    stronger high-based updrafts. While current expectations are that
    risk should remain minimal/isolated, and thus that a WW will likely
    not be required, we will continue to monitor the area for signs of
    any upscale convective growth which could suggest more substantial
    coverage of the threat.

    ..Goss/Grams.. 04/01/2022

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!qdfG38fpVfE35G0iDBkJ9uRNo_A_h5Arvjp4cBgSfCSqUp9ULMY6pUrUfdCdUQlgKo_D7HC2$=
    for graphic product...

    ATTN...WFO...OUN...LUB...AMA...ABQ...

    LAT...LON 35080309 35610271 36300146 36250065 35259849 34429812
    33479855 33610016 33470187 34390282 35080309=20



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thursday, March 30, 2023 20:02:51
    ACUS11 KWNS 302002
    SWOMCD
    SPC MCD 302002=20
    ARZ000-MOZ000-TXZ000-OKZ000-KSZ000-302200-

    Mesoscale Discussion 0385
    NWS Storm Prediction Center Norman OK
    0302 PM CDT Thu Mar 30 2023

    Areas affected...Eastern Oklahoma to western Arkansas and far
    southwest Missouri

    Concerning...Severe potential...Watch unlikely=20

    Valid 302002Z - 302200Z

    Probability of Watch Issuance...5 percent

    SUMMARY...Elevated thunderstorms are expected to slowly increase in
    coverage and intensity through the remainder of the afternoon across
    eastern Oklahoma into adjacent portions of western Arkansas and
    southwest Missouri. While a few large hailstones are possible, this
    threat should remain too limited for watch issuance.

    DISCUSSION...Latest regional radar mosaics have shown a gradual
    increase in convective cells over northern TX into southern OK over
    the past hour. Lightning associated with this activity has steadily
    trended upward within the past 30 minutes as cloud top temperatures
    cool in IR imagery. This suggests that more robust convective
    initiation is likely underway and/or is imminent as lift continues
    within a zone of strong warm advection between 850-700 mb. 18 UTC
    soundings from OUN and FWD show around 500-1000 J/kg MUCAPE with
    effective bulk shear values around 30 knots. This environment is
    supportive of organized cells capable of severe hail, though recent reflectivity trends hint that thunderstorm clustering/storm
    interactions may modulate storm longevity and intensity to a degree
    - likely due to deep-layer shear vectors oriented along the zone of
    ascent. The expectation is for an increase in coverage of this
    activity as the zone of mid-level ascent shifts to the northeast
    into western AR and southwest MO this evening with a few strong to
    severe cells. Given the modest thermodynamic environment and limited
    potential for long-lived discrete convection, watch issuance is not anticipated.

    ..Moore/Hart.. 03/30/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!-TUP5wwl6Um_s55Bmm3HL4AHc2rfoONbAiWDUgOg3aAlHadWaGwHTuoxzRw6LJfITPI3qy3Uh= 95hGrO-_3wvQHPlOFM$ for graphic product...

    ATTN...WFO...LZK...SGF...SHV...TSA...ICT...FWD...OUN...

    LAT...LON 33589482 33519696 33599747 33789786 34149815 34629825
    35109815 35409787 36989538 37199491 37229441 37149403
    36809346 36399308 35649303 34979307 34679315 34229340
    33979371 33829417 33589482=20


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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Monday, April 08, 2024 21:35:36
    ACUS11 KWNS 082135
    SWOMCD
    SPC MCD 082135=20
    TXZ000-082330-

    Mesoscale Discussion 0385
    NWS Storm Prediction Center Norman OK
    0435 PM CDT Mon Apr 08 2024

    Areas affected...Portions of West/Northwest Texas

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

    Valid 082135Z - 082330Z

    Probability of Watch Issuance...95 percent

    SUMMARY...Supercells capable of large to very large hail (2-4 inches
    in diameter) are expected this evening, with convective initiation
    after 22z. Watch issuance is likely.

    DISCUSSION...Visible satellite trends show a steady increase in
    agitated cumulus development within a north-south oriented corridor
    across portions of West Texas. These trends are coincident with a
    southerly influx of richer low-level moisture across this region,
    characterized by surface dew point temperatures in the mid-to
    upper-50s F, beneath cooler mid-level temperatures with northward
    extent. Meanwhile, temperatures have risen into the upper 70s F amid
    strong heating, yielding 1000-1500 J/kg of MLCAPE. SPC mesoanalysis
    shows CIN has mostly eroded across the region in the last hour,
    indicating convective initiation may be imminent.

    The plume of richer low-level moisture is expected to continue
    advancing northward and impinge upon a diffuse cold front positioned
    across parts of Northwest Texas. The combined effects of surface convergence/heating will allow further destabilization and erosion
    of the cap after 22z, with scattered thunderstorms expected
    thereafter. Strong deep-layer shear and elongated/straight
    hodographs should yield discrete supercells, with large to very
    large hail (2-4 inches in diameter) the primary hazard initially.
    Relatively weak low-level shear is expected to limit the initial
    tornado potential, but as the low-level jet increases into the early
    evening hours, the tornado potential may increase if storms can
    remain discrete.

    ..Karstens/Bentley/Hart.. 04/08/2024

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!64Zr081solKD_Z0J5Sd_GQcbo2EpocgPj4bG507wQwTRYax2z8q-6sDqqdH7lJysp_yrKojsd= RR_1NH6HDAH_I5JPG4$ for graphic product...

    ATTN...WFO...FWD...OUN...SJT...LUB...MAF...

    LAT...LON 30710081 30800165 32010196 32980225 33880102 33869956
    33549869 33219844 32669805 31999836 31549955 31369989
    30860030 30710081=20


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