• MESO: Mesoscale Discussion 0467

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, May 19, 2018 23:50:44
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    ACUS11 KWNS 192350
    SWOMCD
    SPC MCD 192350
    TXZ000-OKZ000-NMZ000-200215-

    Mesoscale Discussion 0467
    NWS Storm Prediction Center Norman OK
    0650 PM CDT Sat May 19 2018

    Areas affected...Northeast NM and portions of the OK/TX Panhandles

    Concerning...Severe potential...Watch possible

    Valid 192350Z - 200215Z

    Probability of Watch Issuance...40 percent

    SUMMARY...Isolated strong to severe storms will remain possible as
    ongoing northeast New Mexico storms and any new development advance
    to the east-southeast into western parts of the OK Panhandle and
    much of the Texas Panhandle this evening. Convective trends will be
    monitored for any upscale growth or greater storm coverage that
    would warrant watch issuance.

    DISCUSSION...Trends in mosaic radar imagery showed discrete storms
    that developed within upslope flow into the higher terrain of
    northeast NM are propagating to the east-southeast toward the
    western OK/TX Panhandles where instability is stronger. Additional
    storms have formed in vicinity of a front that extended east-west
    between KCVS and KROW, and then northwest into the front range of
    the southern Rockies. Moist, easterly low-level winds should
    maintain an influx of favorable thetae air into the northeast NM
    band of storms. Mainly isolated strong to severe storms will remain
    possible during the next 3 hours until 9-10 PM, prior to the
    development of strong surface-based inhibition with the loss of
    daytime heating. Steep low- and mid-level lapse rates will favor
    strong outflow wind gusts, while isolated large hail will be
    possible as well. Given 1) the current isolated coverage of the
    stronger storms in northeast NM, and 2) a relatively short window
    for storms to be capable of being severe (until 9-10 PM), a watch
    does not appear necessary at this time. Last several runs of the
    operational HRRR and 12Z HREF suggest mainly isolated occurrences of strong-severe storms, which would confirm the expected conceptual
    evolution of storms across this region this evening.

    ..Peters/Hart.. 05/19/2018

    ...Please see www.spc.noaa.gov for graphic product...

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

    LAT...LON 33620274 33970344 34850412 35240406 36110358 36700316
    36830276 36750141 36060087 35210049 34640050 34090093
    33620171 33620274



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sunday, April 28, 2019 19:12:08
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    ACUS11 KWNS 281912
    SWOMCD
    SPC MCD 281911
    KSZ000-NEZ000-COZ000-282115-

    Mesoscale Discussion 0467
    NWS Storm Prediction Center Norman OK
    0211 PM CDT Sun Apr 28 2019

    Areas affected...Southwest NE...Eastern CO...Far Western KS

    Concerning...Severe potential...Watch unlikely

    Valid 281911Z - 282115Z

    Probability of Watch Issuance...5 percent

    SUMMARY...Isolated strong wind gusts and hail are possible across
    the central High Plains this afternoon.

    DISCUSSION...Thunderstorm coverage is expected to increase over the
    central High Plains this afternoon as ongoing storms continue
    eastward and new storms develop. Multiple elements are promoting
    thunderstorm development across the region including moderate
    westerly flow aloft, an approaching shortwave trough, and marginal
    upslope flow. Downstream air mass is deeply mixed with steep
    low-level lapse rates and high LCLs. Consequently, downdrafts within
    this environment could produce strong wind gusts, particularly
    within the more organized/longer-lived storms. Hail is also possible
    and is most likely during the early stages of storm maturation.

    ..Mosier/Hart.. 04/28/2019

    ...Please see www.spc.noaa.gov for graphic product...

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

    LAT...LON 37480363 39550351 41480313 41560235 40420162 39010116
    37440176 37190277 37480363



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