11.   A surge of hot, humid air will reach into the Great Lakes and Ohio Valley as high pressure transports tropical air northward from the Gulf region.

12.   A wavering front separating the dry air to the north from moist tropical air will support locally heavy showers and thunderstorms over central and southern Florida.

13.   Afternoon thundershowers will be common to the south of a front in the Southeastern States separating tropical air from less humid conditions to the north.

14.   But tropical air, which is irrepressible in summer, began an inexorable northward push Monday.

15.   Clouds and showers will also be common across central New England as tropical air is forced to rise over cooler air to the north.

16.   Farther west, a large area of thunderstorms will develop in the eastern Dakotas and Minnesota as a jet stream disturbance rapidly lifts tropical air near the ground.

17.   Farther south along the East Coast in the tropical air, partly cloudy, warm and sticky weather will be the rule.

18.   Farther south, thundershowers will also proliferate in the tropical air across Florida.

19.   From satellite, the explosion of storms resembled the monsoon in July and August, a period characterized by shifting winds that import tropical air into the deserts.

20.   Heavy thunderstorms will also barrage parts of northern Florida with heavy rains, particularly in the panhandle, where the inland-moving sea breeze lifts tropical air.