ACUS01 KWNS 041200
SWODY1
SPC AC 041158

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0658 AM CDT Thu Jun 04 2026

Valid 041300Z - 051200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING OVER PORTIONS OF THE NORTHERN PLAINS....

...SUMMARY...
Severe thunderstorms capable of large to very large hail and
damaging winds are possible today from parts of the northern High
Plains across northern Nebraska and much of South Dakota. More
isolated occurrences of large hail and damaging winds appear
possible farther south across portions of the central Plains.

...MT/Dakotas/MN...

Fast zonal flow is present today over the northern U.S, with a
shortwave trough now over western MT approaching the northern High
Plains.  Easterly low-level winds have transported 50s dewpoints
westward into southeast MT/northeast WY, where daytime heating and
increasing large-scale ascent will lead to scattered afternoon
thunderstorms.  Coverage of storms is not expected to be very high,
but those cells that can develop will likely be supercells capable
of large hail and damaging wind gusts.  Storms will spread into the
central Dakotas through the evening with a continued severe threat.

Farther east, a surface boundary is forecast to extend from
south-central SD into central MN.  Strong heating in this corridor
will promote scattered thunderstorms after 20z.  Forecast soundings
suggest an environment favorable for hail and damaging winds in the
strongest cells.

...KS/NE/IA...

A weak upper trough has emerged from the central/southern High
Plains overnight and is now moving across western KS.  Radar loops
show an MCV near Hays KS that will track into southeast NE and
western IA later today.  A combination of low-level convergence,
daytime heating, and the affects of the MCV will lead to scattered
afternoon thunderstorms from northeast KS into IA.  CAPE values of
2000-3000 J/kg are expected, along with sufficient deep-layer shear
for multicell or perhaps supercell storm structures.  The potential
exists for hail and damaging wind gusts in the stronger cells this
evening.  An upgrade to SLGT was considered, but the shield of
clouds/precip in vicinity of the MCV limits confidence in heating
and the area of greatest concern at this time.

..Hart/Kerr.. 06/04/2026

$$
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