• DAY1SVR: Day 1 Convective Outlook Resent 1

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Thursday, March 05, 2026 17:28:24
    ACUS01 KWNS 051728
    SWODY1
    SPC AC 051726

    Day 1 Convective Outlook RESENT 1
    NWS Storm Prediction Center Norman OK
    1126 AM CST Thu Mar 05 2026

    Valid 051630Z - 061200Z

    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
    THE EASTERN TEXAS PANHANDLE INTO WESTERN OKLAHOMA...

    ...SUMMARY...
    Scattered severe thunderstorms are expected late this afternoon into
    tonight from northwest Texas and the Texas Panhandle into western
    Oklahoma and southern/central Kansas. Large to very large hail, a
    few tornadoes, and severe/damaging winds are possible.

    ...Southern/Central Plains...
    An upper trough will amplify over the western U.S. today as a broad
    zone of modestly enhanced mid-level southwesterly flow persists over
    the southern/central Plains. At the surface, lee cyclogenesis is
    forecast to occur across eastern Colorado through this evening,
    which will promote continued northward transport of low-level
    moisture across Texas into Oklahoma/Kansas. A surface dryline will
    also extend southward from the low over the southern High Plains.

    Multi-layer cloud cover remains semi-prevalent at late morning but
    peripheral gradual clearing is noted across parts of western North
    Texas as well as along the New Mexico/Texas border vicinity. The
    strongest heating/mixing will occur in vicinity across far
    west/northwest Texas, but it seems probable that storm development
    will occur within the somewhat richer moisture near/just east of the
    Caprock Escarpment including parts of Low Rolling Plains and
    Texas/southwest Oklahoma border vicinity. Such development should
    occur by around 4pm-6pm CST as convective temperatures are breached.

    Somewhat modest/nebulous large-scale ascent will probably support a
    multi-hour period of semi-discrete supercells even if effective
    shear is not robust and low-level shear/SRH a bit modest during time
    of initial development, but nonetheless steadily strengthening
    toward/after 00z/6pm CST. This will include associated threats for
    large to very large hail initially, potentially up to 2-3 inches in
    diameter. The increasing low-level shear through the evening will
    also foster enlarged low-level hodographs and the potential for a
    few tornadoes with this activity, potentially including a
    spatiotemporal window for a strong (EF2+) tornado even if a more
    complex mode is evolving. Over time, convection is forecast to grow
    upscale into a small but potentially intense cluster as it moves
    northeastward into parts of western/northern Oklahoma and southern
    Kansas.

    Isolated supercells may also occur along the length of the dryline
    across west Texas late this afternoon/evening, with associated
    threat for occasional large hail and severe wind gusts. However,
    confidence in any more than isolated coverage remains low due to
    weak large-scale forcing. Farther north, isolated severe hail may
    occur tonight with elevated convection in a low-level warm advection
    regime across eastern Nebraska, northwest Missouri into Iowa.

    ...Ohio Valley to the central Appalachians...
    A mid-level shortwave trough will move quickly eastward today across
    the Ohio Valley. Modest low-level moisture will remain in place
    along/south of a front, with generally weak instability forecast
    across the warm sector. Even so, sufficiently strong low to
    mid-level winds associated with this shortwave trough may promote a
    few instances of damaging winds with loosely organized clusters that
    develop and spread eastward through the afternoon.

    ...Florida Peninsula...
    Beneath an upper high and within an easterly low-level flow regime,
    strong heating will occur today across the Florida Peninsula, with
    dewpoints dropping into the mid 60s F. Despite the upper high,
    mid-level temperatures (-11 or -12C at 500mb) will remain relatively
    cool. Scattered convection appear probable along the western Florida
    Peninsula during the afternoon where low-level convergence will be
    maximized. Locally strong wind gusts will be possible, although
    organized severe thunderstorms are not expected.

    ..Guyer/Wendt.. 03/05/2026

    $$

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