SPC Oct 8, 2026 2000 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 2000Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0232 PM CDT Thu Oct 08 2026

Valid 082000Z - 091200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS THE
CENTRAL PORTION OF THE FLORIDA PENINSULA AND IOWA...

...SUMMARY...
Localized severe thunderstorms may occur across the central portion
of the Florida Peninsula and/or across Iowa tonight.

...20Z Update...
The forecast remains on track, and no changes were needed with this
update. See the previous discussion below for details.

..Weinman.. 10/08/2026

.PREV DISCUSSION... /ISSUED 1123 AM CDT Thu Oct 08 2026/

...Florida Peninsula...
Visible-satellite imagery shows a cloud shield generally near and
north of a residual frontal zone draped across the central portion
of the FL Peninsula. Filtered sunshine generally south of the I-4
corridor will contribute to weak destabilization in the presence of
a tropical airmass characterized by mid-upper 70s deg F surface
dewpoints. Model forecast soundings show moderate effective shear
(25-30 kt) and a veering wind profile through a deep layer. Given
the very moist boundary layer coupled with proximity to the frontal
zone and shear supporting potentially transient weak rotation, a
brief tornado or waterspout is possible.

...Iowa...
Isolated to scattered elevated thunderstorms are forecast
tonight in tandem with around 1000 J/kg MUCAPE developing as warm
advection and isentropic ascent increase to the northeast of a
northeastward-advancing warm front. 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 marginally severe hail possible.


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SPC Oct 8, 2026 1300 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1300Z Day 1 Outlook


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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SPC Oct 8, 2026 0600 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1200Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1252 AM CDT Thu Oct 08 2026

Valid 081200Z - 091200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not forecast across the U.S. today or
tonight.

...DISCUSSION...
A mid-level cyclonic flow pattern will be in place today from the
upper Mississippi Valley into the Northeast, as west-northwesterly
flow aloft remains over most of the remainder of the nation. At the
surface, a moist airmass will be located along the Gulf Coast, where
isolated to scattered thunderstorms will be possible, mainly from
southeastern Louisiana eastward to Florida. Additional storms may
develop in parts of the Desert Southwest and Four Corners region.
Scattered storms will also be possible in Iowa and from northern New
York into northern New England. No severe threat is expected today
or tonight across the continental U.S.

..Broyles/Squitieri.. 10/08/2026


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SPC Oct 8, 2026 0100 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 0100Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0758 PM CDT Wed Oct 07 2026

Valid 080100Z - 081200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
No severe threat is forecast across the U.S. this evening and
tonight.

...DISCUSSION...
A mid-level cyclonic flow pattern is in place over the northeastern
third of the nation, with west-northwesterly flow located over the
remainder of the U.S. At the surface, a moist airmass is located in
along the Gulf Coast, where isolated thunderstorms will be possible
this evening and tonight, mainly across the Florida Peninsula.
Scattered storms will also be possible ahead of a shortwave trough
in the Northeast, and across parts of the Four Corners region. No
severe threat is expected across the continental U.S. through
daybreak on Thursday.

..Broyles.. 10/08/2026


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