• MESO: Mesoscale Discussion 0855

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, May 21, 2022 19:24:15
    ACUS11 KWNS 211924
    SWOMCD
    SPC MCD 211923=20
    FLZ000-GAZ000-212200-

    Mesoscale Discussion 0855
    NWS Storm Prediction Center Norman OK
    0223 PM CDT Sat May 21 2022

    Areas affected...Florida Peninsula

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

    Valid 211923Z - 212200Z

    Probability of Watch Issuance...20 percent

    SUMMARY...Scattered strong storms are expected later this afternoon.
    Isolated hail and strong wind gusts are possible.

    DISCUSSION...Strong heating and destabilization has occurred over
    the FL Peninsula this afternoon, with temperatures rising to near
    90F and MLCAPE in excess of 3000 J/kg noted per recent mesoanalyses.
    Convection has recently begun to develop along the sea breeze along
    the eastern Peninsula, and also across parts of the northwest
    Peninsula, and storms are expected to increase in coverage and
    intensity through the remainder of the afternoon.

    A midlevel vorticity maximum, associated with extensive convection,
    is located over the eastern Gulf of Mexico. Recent VWPs from KTPA
    and KTBW show modestly enhanced midlevel flow to the east of this
    feature, supporting 20-30 kt of effective shear, which will favor
    some storm organization, especially across the western Peninsula.
    Strong buoyancy and relatively steep midlevel lapse rates will
    support some hail threat with the strongest cells/clusters. Weak
    low-level flow is not ideal for an organized severe wind risk, but
    relatively high PW values will support a threat of isolated wet
    microbursts.=20

    At this time, coverage of the severe threat is expected to remain
    relatively isolated, making watch issuance unlikely.

    ..Dean/Hart.. 05/21/2022

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!9LhHcAm-_TYEcv-WjawhMzknUHQSWKq3oebitjxQrcSn8ofR9Inf7N-D0vwBRQQQ9Sz4qXSaD= NN3ZB0B2gZT_J6dRyI$ for graphic product...

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

    LAT...LON 26378183 27478247 28478255 29328277 30118303 30498155
    29778135 28078073 27368041 26668010 26148022 25938111
    25888141 26068173 26378183=20


    =3D =3D =3D
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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wednesday, May 24, 2023 20:46:58
    ACUS11 KWNS 242046
    SWOMCD
    SPC MCD 242046=20
    COZ000-242245-

    Mesoscale Discussion 0855
    NWS Storm Prediction Center Norman OK
    0346 PM CDT Wed May 24 2023

    Areas affected...Southeast CO

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

    Valid 242046Z - 242245Z

    Probability of Watch Issuance...20 percent

    SUMMARY...Storms capable of isolated large hail and severe gusts
    will be possible into early evening.

    DISCUSSION...A supercell is ongoing at 2045 UTC near the Las Animas
    (Colorado) and Union (New Mexico) county line, with other
    intensifying storms noted farther west across Huerfano County, CO.
    Moderate buoyancy (MLCAPE of 1000-1500 J/kg) will continue to
    support the potential for vigorous updrafts through the remainder of
    the afternoon into early evening. The strongest deep-layer
    flow/shear is expected to remain farther south across eastern NM and
    west TX, but weekly veering wind profiles (as noted on the PUX VWP)
    are supporting effective shear of 25-35 kt, sufficient for some
    storm organization and at least transient supercell structures.=20

    While the strongest supercells are expected to remain south of the
    CO border, strong to potentially severe storms may continue to
    develop near the higher terrain, with some left-splitting supercells
    also potentially moving into southeast CO from northeast NM. Large
    hail is likely to be the most prominent hazard, though localized
    severe gusts will also be possible, especially if there are any
    outflow mergers and modest upscale growth.=20

    With the organized severe threat expected to remain relatively
    localized over southeast CO, watch issuance is considered unlikely,
    though this will be reevaluated depending on short-term
    observational trends through the remainder of the afternoon.

    ..Dean/Grams.. 05/24/2023

    ...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!4BpWX1LWLhp87mo8pP_vn9vn7nVgqu8bYgeNkeORL8eZ6cwqajOojGF5psKJtE1uL4EvsipF7= VRTnuwPPxztJDLL7Fo$ for graphic product...

    ATTN...WFO...PUB...

    LAT...LON 37050380 37090479 37600498 38190491 38450455 38160308
    37780275 37250264 37060286 37050380=20


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