ZCZC SPCSWOD48 ALL ACUS48 KWNS 120835 SPC AC 120835 Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0335 AM CDT Wed Aug 12 2026 Valid 151200Z - 201200Z ...DISCUSSION... Most guidance depicts one or more midlevel vorticity maxima cresting the upper ridge and moving across the Upper Midwest/Great Lakes region on Saturday. However, there is considerable spread regarding the timing of these features and the northward extent of substantial destabilization. Substantial timing differences remain regarding the front, but severe probabilities may eventually be needed for this scenario. This pattern will continue to favor at least an isolated severe threat, with low-predictability MCS potential.