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A series of mid-level disturbances will ride along the flow of an upper-level region of high pressure centered over the Mississippi Valley, triggering several rounds of thunderstorms for the Northern Plains and Upper Midwest through Sunday. The least active day will be Friday, where Minnesota and Wisconsin will face scattered thunderstorms both in the morning and the evening. Strong wind gusts and isolated large hail will be the main threats with Friday’s storms. The morning storms are not expected to be severe.ย  A moist surface layer will remain in the wake of the morning storms, but clouds and an inversion could prevent most of the area from developing thunderstorm activity until late in the afternoon, when isolated storms may develop in Central Wisconsin and southern and east-central Minnesota where the inversion “capping” convection is expected to clear first. At the surface, a warm frontal boundary will stall over the Northern…