Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1143 AM CDT Fri Aug 14 2026
Valid 141630Z - 151200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE
MIDWEST...
...SUMMARY...
Severe thunderstorms will be possible this afternoon and evening
across parts of the middle Missouri and middle Mississippi Valleys.
Isolated severe wind gusts will also be possible in parts of the
central Plains and from the Ohio Valley to the Mid-Atlantic, as well
as parts of the Northeast and Southwest.
...Mid Missouri and mid Mississippi Valleys...
Thunderstorms have largely weakened through the early morning across
the middle Missouri Valley, with more of a lingering persistence
across Illinois/Indiana. Scattered showers remain rather common,
however, regionally with semi-prevalent cloud cover. Multiple MCVs
persist regionally at midday, including across central Iowa, and
more prominently near the Nebraska/Iowa border. Regional WSR-88D
data from Omaha/Des Moines/Davenport continue to sample enhanced
westerlies (35-50 kt) between 4-8 km AGL in association with these
MCVs.
Primary severe risk across this region today will be linked to the
amount of air mass recovery and associated destabilization that
occurs along the southern periphery of the residual convection and
ahead of the aforementioned slow-moving MCVs. Ample low-level
moisture is in place, and differential heating between the residual
cloud debris may yield an effective warm-front-like zone across
southern Iowa or near the Iowa/Missouri border. The airmass along
and south of this is forecast to destabilize and become moderately
to strongly unstable by the late afternoon. This should result in
renewed thunderstorm development by late afternoon into evening,
with sufficient deep-layer shear to support organized updrafts and
potentially some initial supercells. Modestly enhanced low-level
winds/SRH could yield a tornado risk. Strong wind gusts will
otherwise be possible with water-loaded downdrafts, as well as with
any bowing segments through this evening.
...Ohio Valley/Central Appalachians/Mid-Atlantic...
Outflows/differential heating across the lower Ohio Valley will
influenced thunderstorm redevelopment this afternoon, while storms
are starting to develop/increase across the Appalachians vicinity.
Vertical shear will generally be weak, but strong updrafts and ample
moisture will yield the potential for wet microbursts regionally.
...Central High Plains...
A shortwave trough currently moving through the Lower Colorado River
Valley is forecast to continue northeastward through the Four
Corners. Ascent associated with this wave will combine with
orographic lift in the foothills of the Rockies to support scattered
convective initiation by early afternoon. Thunderstorms will then
move northeastward into the moderately buoyant airmass over the
central High Plains. Deep-layer shear will be modest but sufficient
for a few organized updrafts capable of hail and damaging gusts.
...Northeast States...
Influenced by strong northwesterly flow aloft, a few stronger to
locally severe relatively low-topped storms may occur this afternoon
across northern/upstate New York into southern New England, with
strong/gusty winds as the primary hazard as convection progresses
southeastward.
...Lower Colorado River ...
With a moist air mass across the region, strong heating will support
afternoon airmass destabilization, yielding moderate buoyancy this
afternoon. Slightly stronger mid-level flow is anticipated over the
southern Nevada vicinity, supporting the potential for isolated
strong wind gusts.
..Guyer/Chalmers.. 08/14/2026
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