424
ACUS01 KWNS 081204
SWODY1
SPC AC 081203

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0703 AM CDT Mon Jun 08 2026

Valid 081300Z - 091200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING FROM NORTHEAST COLORADO AND SOUTHEAST WYOMING INTO PARTS OF
NEBRASKA AND KANSAS....

...SUMMARY...
Scattered thunderstorms with large to very large hail, severe wind
gusts potentially above 70 mph, and a few tornadoes will be possible
today from the Front Range east-southeastward into the central
Plains. Isolated severe gusts and hail will also be possible in
parts of the southern High Plains, northern Plains and mid
Mississippi Valley. An isolated hail threat may develop toward the
end of the period in the northern High Plains.

...Eastern CO into Western NE/KS...
Relatively fast southwest flow aloft is present today from the
southwest states into the central Rockies.  A surface low will
remain over southwest KS through the day, maintaining a stream of
easterly low-level winds and moist advection into eastern CO and
northwest KS.  Daytime heating will further aid the westward
transport of moisture, resulting in an unstable air mass over the
foothills near Denver/CO Springs.  Thunderstorms are expected to
develop in this corridor this afternoon, in an environment of steep
mid-level lapse rates, CAPE around 1000 J/kg, and favorable
deep-layer shear.  Supercell structures capable of large hail will
be the main early threat.  As this activity moves/builds eastward
into the Plains, it will encounter increasingly moist/unstable air
and strengthening low-level shear profiles by early evening.  This
will promote a risk of a few supercell tornadoes, large hail, and
damaging winds. An upgrade to ENH risk may be needed in later
updates as clouds/daytime heating and affects of ongoing NE
convection is assessed.

By mid-evening, the activity is expected to be organizing upscale
into linear structures as it moves into southwest NE and northwest
KS.  An increasing risk of damaging winds will likely develop, with
storms spreading eastward into the overnight hours.

...Northwest AR...
A cluster of intense thunderstorms is ongoing this morning over
southwest MO/northeast OK.  This activity could continue to pose a
risk of isolated damaging wind gusts through the morning into
northwest AR before weakening later today.

...Southern KS/Northwest OK/TX Panhandle...
A dryline will become established this afternoon from the eastern TX
Panhandle to the surface low in south-central KS.  Hot conditions
along/west of the dryline will help to initiate isolated
thunderstorms.  These high-based cells could pose an occasional
threat of hail and damaging winds for a few hours.

...Eastern KS...
A moist and very unstable air mass will lie across eastern KS today
with CAPE values of 3000-4000 J/kg, but with a weak cap.  CAM
guidance varies on the potential for afternoon/early evening
thunderstorms in this area, but enough 00z runs suggested a threat
to maintain the SLGT.  Any storm that can form would pose a risk of
large hail and damaging winds.

...Southern IL/Western KY...
An upper trough continues to lift northeastward across the mid MS
valley today, with a moist/moderately unstable air mass present from
southern IL southward.  Mid-level lapse rates are marginal for
severe storms, and winds aloft are modest.  Nevertheless, veering
winds-with-height and sufficient CAPE will pose an occasional risk
of strong storms capable of gusty winds or a tornado today.

..Hart/Wendt.. 06/08/2026

$$