• MESO: Mesoscale Discussion 0263

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Sunday, April 15, 2018 06:46:32
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    ACUS11 KWNS 150646
    SWOMCD
    SPC MCD 150645
    GAZ000-FLZ000-ALZ000-150845-

    Mesoscale Discussion 0263
    NWS Storm Prediction Center Norman OK
    0145 AM CDT Sun Apr 15 2018

    Areas affected...southeast Alabama...parts of the Florida
    Panhandle...and extreme southwest Georgia

    Concerning...Tornado Watch 50...

    Valid 150645Z - 150845Z

    The severe weather threat for Tornado Watch 50 continues.

    SUMMARY...Isolated strong wind gusts and/or a brief tornado or two
    remain possible in/near Tornado Watch 50.

    DISCUSSION...Latest objective analysis shows a narrow zone of
    moist/minimally unstable air across WW 50, ahead of the
    eastward-moving line of convection. As a zone of ascent associated
    with a very subtle disturbance within the broader trough (noted over
    the northwest Gulf per WV loop) spreads eastward across the central
    Gulf Coast region, storms will likely be maintained over the next
    several hours. With background shear supportive of updraft organization/rotation, limited severe/brief tornado risk may persist
    across the WW area. Strongest convection, however, is forecast to
    remain offshore, south of the Florida Panhandle coast.

    ..Goss.. 04/15/2018

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

    ATTN...WFO...FFC...TAE...BMX...MOB...

    LAT...LON 29108635 29508657 31008633 31578608 31958488 31898449
    31168447 30018510 29178489 28518503 28738589 29108635



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  • From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Saturday, April 06, 2019 15:09:25
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    ACUS11 KWNS 061409
    SWOMCD
    SPC MCD 061408
    TXZ000-061715-

    Mesoscale Discussion 0263
    NWS Storm Prediction Center Norman OK
    0908 AM CDT Sat Apr 06 2019

    Areas affected...Central/Southeast/East TX

    Concerning...Severe potential...Watch possible

    Valid 061408Z - 061715Z

    Probability of Watch Issuance...60 percent

    SUMMARY...Increasing thunderstorm coverage and intensity may
    necessitate watch issuance during the next several hours. All severe
    hazards, including tornadoes, are possible.

    DISCUSSION...Thunderstorms have developed across the broad warm
    frontal zone extending from central TX into southern LA. Air mass
    across this region is currently characterized by temperatures in the
    upper 60s/low 70s and dewpoints in the upper 60s. These conditions
    do not currently support surface-based storms but persistent
    forcing for ascent coupled with continued moisture advection will
    likely erode any inhibition within the next few hours.

    Bulk vertical shear is supportive of organized storms capable of all
    severe hazards. Surface winds are expected to remain relatively
    weak, which leads to some uncertainty regarding the tornado
    potential. Even so, augmented lift, increased surface vorticity, and
    higher low-level moisture along the front (which is expected to
    sharpen as daytime heating increases), could lead to a greater
    tornado threat closer to the front.

    Convective trends will be monitored closely and a watch may
    eventually be needed.

    ..Mosier/Hart.. 04/06/2019

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

    ATTN...WFO...LCH...SHV...HGX...FWD...EWX...

    LAT...LON 30749866 31639711 32169588 32069437 31329374 30159433
    29109710 29299920 29909941 30749866



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