1.   Along the fringe of the cooler air, a few strong thunderstorms may erupt in Missouri and eastern Oklahoma.

2.   Along the perimeter of this sultry air mass, thunderstorms will erupt from the Dakotas to northern Michigan.

3.   As an approaching cold front undercuts and lifts the moist air, scattered thunderstorms will erupt from the lower Mississippi Valley to the Carolinas.

4.   As a result, scattered thunderstorms will erupt over parts of the central Plains as a disturbance energized by these fast winds emerges from the Rockies.

5.   As differing air streams converge along a cold front in Texas, large thunderstorms will erupt and move into Oklahoma and Arkansas.

6.   As humid air from the Gulf of Mexico interacts with a jet stream disturbance, strong thunderstorms will erupt from the lower Mississippi to the lower Ohio Valley.

7.   As a series of jet stream disturbances intercept the fast flow of warm air, isolated but severe thunderstorms will erupt across the Middle West and Great Lakes.

8.   As the cool air mass spreads east on Saturday, thunderstorms will erupt across parts of Montana and North Dakota.

9.   As another disturbance ejects from the Rockies later Thursday, a few thunderstorms will erupt near the tail end of the front in the southern Plains.

10.   As the potent June sun heats the muggy air, thunderstorms will erupt by afternoon, but many spots will stay dry.