spc ac 050507
day 2 convective outlook
nws storm prediction center norman ok
1207 am cdt tue may 05 2026
valid 061200z - 071200z
...there is a slight risk of severe thunderstorms from northeast tx
to the lower ms and tn valleys...
...summary...
scattered strong to severe thunderstorms are expected wednesday
afternoon and evening across portions of texas into the lower
mississippi and tennessee valleys/southern appalachians. damaging
winds, large hail, and a couple of tornadoes will be possible.
...synopsis...
a positive-tilt large-scale upper trough will extend from the upper
great lakes to the southwest early wednesday. the southern extent of
the trough will develop east toward the southern high plains to
northwest mexico by thursday morning. strong mid/upper southwesterly
flow ahead of the trough will overspread much of the southern and
eastern u.s. at the surface, a cold front will extend from the upper
ohio valley to central tx during the morning. the front is expected
to develop south/southeast through the period, becoming oriented
from the southern mid-atlantic to south tx by thursday morning.
ahead of the front, rich gulf moisture will be in place across tx
into the lower ms and tn valleys, decreasing with northeast extent
into parts of the southern appalachians.
...northern tn valley and southern appalachians...
forecast guidance varies, but some showers/thunderstorms may be
ongoing wednesday morning across parts of ar into northern parts of
the tn valley within a warm advection regime on the nose a gradually
weakening low-level jet. this activity will likely play some role in
destabilization later in the day across parts of the tn valley into
the southern appalachians vicinity. nevertheless, strong deep-layer
shear and a moist boundary layer will be sufficient for at least
some severe risk, including damaging wind gusts and perhaps hail.
some tornado risk could also materialize given favorable low-level
shear and 0-1 km srh increasing to greater than 250 m2/s2 during the
afternoon/evening. however, this is less certain given
aforementioned instability issues and later storm timing into the
southern appalachians.
...tx to ms/al...
further south from northeast tx into ms/al, strong destabilization
is forecast where deep boundary layer moisture and stronger daytime
heating occurs. mlcape in the 2000-3000 j/kg range appear possible
in particular across northern la into ms. midlevel southwesterly
flow is expected to increase by late afternoon into the evening as
early capping will be overcome as the surface front begins to
develop south/southeast. convection along the cold front may quickly
transition to linear/bowing segments given deep shear parallel to
the surface boundary. however, low-level flow in latest model
guidance does not appear to be overly veered, especially near
northern la into ms. forecast hodographs indicate enlarged,
favorably curved hodographs across this area. if open warm sector
supercells develop, a risk for tornadoes (perhaps a couple strong
tornadoes) will be possible. furthermore, steepening midlevel lapse
rates are evident in forecast soundings, along with
elongated/straight hodographs and 45+ kt effective shear magnitudes.
this indicates any semi-discrete supercells could pose a risk for
large to very large hail. with time during the evening/nighttime
hours, convection should generally congeal into a line or bowing mcs
and spread eastward across the tn valley toward the southern
appalachians, posing a risk for damaging gusts. higher tornado and
hail probabilities were considered across parts of the lower ms
valley, however, given uncertainty in storm mode and coverage of
discrete supercells, will hold at level 2 (slight) risk for now.
across portions of central tx overnight, some guidance suggests
convection may develop within low-level warm advection as the
western extent of the surface cold front dives southward across the
edward plateau vicinity. if storms develop, they would likely be
elevated. nevertheless, a hail risk could materialize within the
conditional scenario late in the forecast period.
..leitman.. 05/05/2026
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note: the next day 2 outlook is scheduled by 1730z