The greatest risk for damaging bursts of wind and large hail will be a corridor over southern and eastern Nebraska to Wisconsin including southern Minnesota, northwestern Illinois and much of Iowa.
The at-risk area will span Omaha, Des Moines and Madison, Wis. A strong thunderstorm could also unleash high winds in Chicago and Milwaukee.
On Tuesday into Tuesday night, the same overall weather setup will be favorable for strong thunderstorms in a belt from the central High Plains east to the Mississippi Valley and the southern Great Lakes, or a bit farther south compared to Monday's.
Damaging winds and isolated large hail will possible in strongest storms erupting from Cleveland and Chicago west to Denver.
Story by AccuWeather.com Senior Meteorologist Jim Andrews