...Midwest...
Strong large-scale forcing for ascent will spread into the mid-MS
Valley region Tuesday afternoon as exit region of upper jet shifts
across IA. Diffluent high-level flow should overspread this region
which should aid scattered thunderstorms ahead of the front from MO,
north to near the surface low. Latest short-range model
guidance/CAMs are fairly aggressive in developing scattered deep
convection, possibly supercellular, within an increasingly sheared
regime. While low-level moisture is initially a bit dry, rapid
boundary-layer moistening is expected across MO into IL ahead of the
wind shift. This should allow substantial buoyancy to evolve that
would support potentially organized supercells. Large hail, damaging
winds, and a few tornadoes are possible with pre-frontal supercells.