308
ACUS02 KWNS 151710
SWODY2
SPC AC 151708

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1208 PM CDT Tue Sep 15 2026

Valid 161200Z - 171200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
NORTHERN UTAH...

...SUMMARY...
A couple of strong to severe thunderstorms appear possible across
northern Utah on Wednesday.

...UT...
An upper low will move slowly southward across northern CA, with low
pressure and gusty south winds developing over NV. Substantial
moisture will exist east of this trough, with precipitable water
around 1.00" over much of UT. Temperatures aloft will be coolest
early in the day, with gradual height rises over time which may
mitigate destabilization somewhat. However, mid to upper level shear
will be strong due to the upper jet, and may support cellular storm
mode and marginal hail. Storms may develop early in the day, with
additional activity during the afternoon.

...Northern MO/IA eastward into OH...
A 600 dm high at 500 mb will remain over the TN Valley, with
generally weak winds aloft south of the Great Lakes. A weak
east-west oriented surface trough is forecast to stretch from MO
into OH, with 70s F dewpoints present. Daytime heating will result
in an uncapped air mass, with scattered thunderstorms within this
zone. The poor lapse rates aloft and building upper ridge should
result mainly in non-severe thunderstorms. However, sporadic strong
gusts cannot be ruled out.

..Jewell.. 09/15/2026

$$