218 ACUS03 KWNS 240730 SWODY3 SPC AC 240729 Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Mon Aug 24 2026 Valid 261200Z - 271200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS THE CENTRAL HIGH PLAINS...THE OZARKS INTO THE LOWER MISSISSIPPI VALLEY...AND THE MIDWEST INTO THE GREAT LAKES... ...SUMMARY... Scattered strong to severe storms are possible across the central High Plains, Ozarks into the Lower Mississippi Valley, and in the Midwest into the Great Lakes. ...Midwest into the Great Lakes... A mid-level shortwave trough will advance through the Great Lakes on Wednesday. A surface cold front will move southeastward through the period with thunderstorms developing along it by mid-afternoon. Upper 60 to low 70s dewpoints will result in moderate instability. Multicell clusters and perhaps a few supercells will be possible along and ahead of the cold front during the afternoon and into the evening. Isolated large hail and damaging wind gusts will be the primary threat. However, some low-level wind shear could result in a localized tornado threat with any supercells which develop. ...Central High Plains... A weakening of the mid-level ridge will support scattered storm development within a weak upslope flow regime across eastern Colorado on Wednesday. These storms will form on the southwestern periphery of the stronger mid-level flow traversing the northeastern portion of the upper-level ridge. This may result in sufficient shear for a few south-southeasterly moving supercells capable of large hail and severe wind gusts. ...Ozarks into the Lower Mississippi Valley... A weak surface low will drift slowly southeastward along a frontal boundary into the ArkLaTex on Wednesday. Strong heating is expected with temperatures in the upper 90s to low 100s. This deeply-mixed and uncapped airmass will support scattered thunderstorm development by mid-afternoon. Northwesterly flow aloft is relatively weak (~20 knots). This will likely result in mostly unorganized storms with a few multicell clusters. Despite the relatively weak shear, the strong heating will support some damaging wind gusts. ..Bentley.. 08/24/2026 $$