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Isolated severe storms appear possible over portions of the mid- Mississippi and Ohio Valleys Thursday afternoon through night.
SPC AC 130708
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0208 AM CDT Tue Oct 13 2026
Valid 151200Z - 161200Z
THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER PORTIONS OF THE MID-MISSISSIPPI AND OHIO VALLEYS
### SUMMARY
Isolated severe storms appear possible over portions of the mid- Mississippi and Ohio Valleys Thursday afternoon through night.
Synopsis
A short-wave trough over SK/MB Thursday morning is forecast to undergo considerable amplification while translating into the Great Lakes late Thursday night/early Friday. Ahead of that feature, an upper low will weaken into an increasingly sheared open wave while accelerating from the central High Plains into the Midwest. At the surface, an area of low pressure is expected to develop along a poleward-advancing warm front from central or eastern KS through the mid-MS and OH Valleys to the lower Great Lakes. Meanwhile a trailing cold front will surge south through much of the southern Plains and into the lower-MS Valley.
### Mid-Mississippi and Ohio Valleys
Showers and thunderstorms may be ongoing at 12Z Thursday from portions of the central Plains into the mid-MS Valley within a zone of warm-air and moisture advection preceding the surface low. A subset of the early-day storms may persist through the day with associated cloud cover limiting daytime heating and resultant air mass destabilization in those areas. Where cloud breaks can occur, stronger diabatic heating coupled with boundary-layer dewpoints in the low to mid 70s may contribute to a corridor of moderate instability by afternoon, which would become a preferred zone of diurnally enhanced thunderstorm development.
Both vertical shear and forcing for ascent are forecast to steadily strengthen from Thursday afternoon through night, leading to the potential for a fast-moving complex of storms to traverse the region with an associated risk for locally damaging wind gusts.
..Mead.. 10/13/2026
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