Isolated severe wind gusts and hail will also be possible from parts of the central and northern Plains into the Midwest. ...Ohio Valley/Central Appalachians... At mid-levels, west-northwesterly flow will remain in place on Tuesday from the northern Plains to the central Appalachians. This would support supercells with severe wind gusts and an isolated tornado threat. Low-level convergence will aid convective initiation during the mid to late afternoon, with isolated storms moving east-southeastward from the northern Plains into the Midwest. This will support supercells with isolated severe wind gusts and hail.