ACUS01 KWNS 061946
SWODY1
SPC AC 061945

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0145 PM CST Fri Mar 06 2026

Valid 062000Z - 071200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS THE
CENTRAL/SOUTHERN
PLAINS AND LOWER MISSOURI VALLEY...

...SUMMARY...
Scattered severe thunderstorms are expected from mid-afternoon
through tonight across parts of the southern/central Plains to the
Ozarks and Midwest. The greatest potential for a few strong
tornadoes and very large hail should exist across eastern portions
of Oklahoma/Kansas/Nebraska into western Arkansas/Missouri and
southern Iowa.

...20z Update...
No categorical changes were made to the D1 Convective Outlook.

A corridor of more favorable tornado potential is possible this
evening near the interface of the surface low and warm front across
far southeastern Nebraska/northeast Kansas/northwest Missouri. Here,
within the warm sector cells may develop ahead of the cold front
within an region of enhanced low-level shear (given the placement of
the warm front and forecast increase in south-southwesterly
low-level jet). There are some complicating factors, such as ongoing
cloud cover and convection in the warm air advection regime this
morning. Some sheltered heating is ongoing with breaks in the cloud
cover, with MLCAPE around 1000 J/kg nosing in from the west. The 18z
soundings from Lamont, OK and Topeka, KS show this trend in
instability as well as enlarged/curved hodographs and strong 50 kt
flow aloft. Forecast soundings depict further enlargement of
low-level hodographs this evening, amid steep lapse rates and dew
points in the low to mid 60s, and STP values around 2. Given the
favorable parameter space, tornado probabilities were increased with
this outlook.

Otherwise, the Enhanced remains unchanged. See previous discussion
below for more information.

..Thornton.. 03/06/2026

.PREV DISCUSSION... /ISSUED 1029 AM CST Fri Mar 06 2026/

...Central Plains and Midwest/Great Lakes...
Low-level moisture will continue to stream northward today ahead of
the cold front across east-central Nebraska and western Kansas, with
upper 50s to low 60s F surface dewpoints common by mid afternoon.
Cold temperatures aloft and steepened mid-level lapse rates will
support the development of at least 1000-1500 J/kg of MLCAPE with
daytime heating. More instability may exist farther south into
Kansas where greater low-level moisture will be in place, although
such details are complicated by existing convection/cloud cover
across eastern Kansas into northwest Missouri at mid-morning.

Current expectations are for scattered robust thunderstorms to
develop around mid afternoon (20-22Z) across southeast
Nebraska/northern Kansas and vicinity, in close proximity to the
surface low and ejecting shortwave trough. Strong deep-layer shear
associated with a 50-70+ kt mid-level jet will easily support
organized updrafts including multiple supercells initially. This
activity will pose a risk for large to very large hail, but fairly
quick upscale growth into one or more bowing clusters with a wind
damage threat seems probable along/ahead of the cold front as
convection spreads into Iowa/Missouri this evening. Some risk for at
least isolated severe/damaging winds may persist late tonight into
early Saturday morning across Wisconsin/Illinois and Lower Michigan
if these clusters can maintain intensity, although instability is
forecast to become more limited with eastward extent across these
areas.

A few tornadoes may occur with sustained supercells or embedded QLCS
circulations across the central Plains/Midwest along/south of the
warm front given favorable low-level shear and enlarged/curved
hodographs. Pending development into the warm sector, a strong
tornado could occur with any supercells this evening as low-level
shear strengthens in tandem with a south-southwesterly low-level
jet.

...Southern Plains and Ozarks...
Thunderstorms have increased and locally intensified this morning
across north-central Oklahoma into southeast Kansas, complicating
the later-day scenario somewhat with poorly resolved
short-term/convective details in guidance. Convective initiation
along the length of the dryline in Oklahoma/Texas still remains a
bit uncertain this afternoon/evening, as low-level convergence will
be weak and stronger large-scale ascent associated with the ejecting
shortwave trough will remain mostly displaced to the north of the
region. Even so, especially to the south of aforementioned early day
storms, at least isolated deep convective development is plausible
into mid/afternoon in areas near the dryline, but perhaps more
likely to its east potentially related to differential
heating/somewhat richer low-level moisture.

Where cells can sustain and mature, they would likely become severe
and pose a threat for very large hail given the presence of steep
mid-level lapse rates noted on the 12Z OUN observed sounding, along
with around 35-45 kt of deep-layer shear aiding updraft
organization. The tornado threat would also increase this evening
with any persistent supercells as low-level shear gradually
strengthens. Additional and more probable robust thunderstorm
development remains apparent later this evening/tonight as the cold
front accelerates south-southeastward. Both large hail and damaging
winds may occur with this overnight activity through the end of the
period.

$$
--- SBBSecho 3.28-Linux
 * Origin: Capitol City Online (618:250/1)