Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0810 PM CDT Wed Jun 17 2026
Valid 180100Z - 181200Z
...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS SOUTH-CENTRAL
PORTIONS OF ILLINOIS AND INDIANA...
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ALONG THE NORTHERN
GULF COAST...
...SUMMARY...
A corridor of tornado, damaging hail and wind threat persists from
south-central Illinois into Indiana this evening. A broader zone of
severe hail and wind extends from southeast Kansas into western
Ohio.
...IL...IN...MO...OH...
The greatest tornado threat corridor extends from south-central IL
into parts of central/southwest IN this evening, where air mass
recovery continues out of the southwest. Supercells in this region
have been tornadic at times, also producing large damaging hail.
Given the extreme shear downstream, and continued low-level
theta-advection, the environment remains conditionally favorable for
a couple strong tornadoes through this evening over a small portion
of IL and IN. The threat may extend as far east as western/central
OH later tonight, with tornado potential depending on instability.
For more information see mesoscale discussion 1171.
...Northern Gulf Coast...
A moist and unstable environment exists across LA and into southern
MS/AL ahead of Arthur. Low-level shear may increase further this
evening, with periodic mini-supercell potential and tornado risk.
For more information see mesoscale discussion 1172.
..Jewell.. 06/18/2026
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