Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0759 PM CDT Mon Apr 27 2026
Valid 280100Z - 281200Z
...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF
SOUTHEASTERN MISSOURI INTO FAR SOUTHERN ILLINOIS AND WESTERN
KENTUCKY...
...SUMMARY...
Severe storms should continue through tonight with a wind and hail
threat. A few tornadoes may still occur, and a couple of strong
tornadoes remain possible.
...Synopsis...
A negatively tilted 500 mb mid-level trough continues to traverse
the Upper Midwest in tandem with a surface low, supporting a surface
cold front to sweep across the Mid-MS Valley. A persistent elongated
convective system has materialized along the cold front, accompanied
by several embedded and preceding supercells. These storms have a
collective history of severe wind and hail, with some stones
reaching the 2-3 inch diameter range.
Upper 60s to low 70s F surface dewpoints, beneath 8+ C/km mid-level
lapse rates, resides ahead of the cold front/storms, yielding over
3000 J/kg MLCAPE in spots. Meanwhile, strong mid-level flow
associated with a speed max is overspreading an intensifying (45+
kt) southwesterly low-level jet, resulting in 50+ kts of effective
bulk shear and large/curved low-level hodographs with 300-500 m2/s2
effective SRH (per 00Z mesoanalysis and regional VADs). Supercells
have failed to organize and produce tornadoes up to this point.
However, storms along/ahead of the cold front will continue to
advance eastward toward the low-level jet/shear axis. Therefore, an
uptick in tornado activity may still occur early tonight, especially
with any discrete, sustained supercells that can develop. Discrete
storms may also be accompanied by severe hail, with severe wind
gusts likely with continued linear storm modes.
..Squitieri.. 04/28/2026
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