Bring 'er in please!
A plume of steep 700-500 mb lapse rates, a reservoir of
low-level moisture over parts of the Midwest, agreement/consistency
in models showing the strength and evolution of the aforementioned
mid-level disturbance, all combine to yield sufficient confidence in
the notion for a concentrated area of severe-wind producing
thunderstorms over parts of the Upper Midwest/western Great Lakes on
Tuesday (day 5). Considerable uncertainty exists by the end of day
5 into day 6 to preclude any downstream highlights.