RSS Mesoscale Discussions from Storm Prediction Center
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0759 PM CDT Wed Jun 24 2026
Valid 250100Z - 251200Z
...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS TONIGHT ACROSS
PARTS OF NORTHEASTERN COLORADO INTO NORTHWESTERN KANSAS...
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING
ACROSS PARTS OF THE UPPER MIDWEST AND THE GREAT BASIN...
...SUMMARY...
Scattered severe storms accompanied by large hail may gradually
evolve into an organizing cluster with increasing potential to
produce damaging wind gusts across parts of northeastern Colorado
into parts of southwestern Nebraska and western Kansas tonight.
...01Z Update...
...Front Range into adjacent central Great Plains...
Warm advection based near the 700 mb level, near the northeastern
periphery of a plume of elevated mixed-layer air lingering to the
east of the Front Range, is becoming the focus for increasing
thunderstorm development across and east-southeast of the Cheyenne
Ridge vicinity. This seems likely to continue to grow upscale
during the next few hours, aided by inflow of seasonably moist
boundary-layer air emanating from along and south of a stalled to
slowly southwestward advancing surface front across this region
through the central Nebraska/Kansas state border vicinity.
Beneath 20 kt westerly deep-layer mean flow (but strongly sheared
due to pronounced veering of winds from easterly to westerly with
height), this activity probably will gradually organize as it
propagates east-southeastward this evening, and pose increasing
potential for strong to severe surface gusts. Strongest gusts and
highest severe wind probabilities may eventually focus on the
southwestern flank of the evolving system across parts of east
central Colorado into northwest/west central Kansas, near the nose
of a modest (30+ kt around 850 mb) southeasterly boundary-layer jet.
...Southern Wisconsin/Northern Illinois...
Low-level moistening is maintaining boundary-layer instability in a
pre-frontal corridor across west central through northeastern
Illinois early this evening. As larger-scale mid-level troughing
continues to slowly dig across the Upper Midwest/Great Lakes region,
forcing for ascent may maintain vigorous thunderstorm development
posing a risk for severe hail and wind across parts of southeastern
Wisconsin/northeastern Illinois into portions of northwestern
Indiana into mid to late evening.
..Kerr.. 06/25/2026
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