ACUS01 KWNS 081248
SWODY1
SPC AC 081246

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0746 AM CDT Thu Oct 08 2026

Valid 081300Z - 091200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE FLORIDA PENINSULA AND UPPER MIDWEST/MIDDLE MISSOURI VALLEY...

...SUMMARY...
Localized severe thunderstorms may occur across the middle Florida
Peninsula today and/or across parts of the Upper Midwest and middle
Missouri Valley tonight.

...Florida Peninsula...
A semi-persistent general pattern continues with storms focusing
along a convectively reinforced front from the eastern Gulf across
the middle part of the Peninsula. While not a high-confidence
scenario, a few subtleties may imply a bit more near-shore supercell
and waterspout/brief tornado potential as compared to yesterday.

The latest WSR-88D VWP data from KTBW samples weak
lower-tropospheric winds but with moderate directional turning and a
speed increase above 3km AGL, netting around 25-30 kt effective
shear. This is consistent with a modest 00z-to-12z increase in winds
aloft noted in Tampa Bay observed soundings, with a mid-level
cooling trend also noted. Winds aloft may further trend a bit upward
this afternoon per various guidance, potentially supporting a few
organized/sustained storms capable of at least weak/transient
rotation, especially in vicinity of the surface front. It also
appears that clouds are not quite as prevalent early today within
the nearby warm sector inland, which could modestly boost parcel
accelerations within a very moist environment, characterized by
73-75F surface dewpoints. The overall scenario could seemingly
support some potential for near-shore waterspouts or possibly even a
brief tornado inland near the front.

...Iowa/middle Missouri Valley tonight...
Isolated to widely scattered elevated thunderstorms should develop
tonight as warm advection and isentropic ascent increase to the
northeast of a northeastward-advancing warm front. Source region
moisture will be modest, but sufficient mid-level moistening will
support thunderstorm potential on the edge of the Great Plains
elevated mixed layer. While some elevated moisture/buoyancy guidance
depictions may be a bit too aggressive (such as the NAM), a general
increase in guidance trends lends credence to the possibility that
750-1250 J/kg MUCAPE may materialize. With effective shear in the
cloud-bearing layer expected to increase to 40+ kt, the possibility
exists for a few elevated supercells late this evening into the
overnight, with a few instances of hail possible.

..Guyer/Dean.. 10/08/2026

$$
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