21.  A cool front crossing the plains states will trigger broken bands of thunderstorms from the Texas panhandle into the northern plains.

22.  A cool front pushing south through the Rockies will temper the heat in the central sections.

23.  A cool front will be the focus for showers and thunderstorms from the eastern Great Lakes to the southern Missouri River Valley.

24.  A cool front will lose its southeast momentum and stall from northern Ohio to central New England.

25.  A cool front will push slowly south from the Great Lakes and Middle West.

26.  A corridor of moisture from the Pacific will meet with a cool front in the southern Rockies, prompting scattered thunder from New Mexico to southern Wyoming.

27.  A broken band of showers and thunderstorms will accompany a cool front in New England.

28.  A broken band of thunderstorms will precede a weakening cool front from the western Great Lakes to the central Plains.

29.  A chilled Pacific air mass will flow into the northern Rockies behind a cool front.

30.  A cool front moving through Ontario will cause scattered thunderstorms to erupt in Michigan on Friday afternoon.