11.   Farther east, humid air streaming north from the Gulf of Mexico will fuel scattered showers from Alabama and Georgia to the northeast seaboard.

12.   High pressure in the Atlantic will keep the Northeast seaboard mainly dry until Sunday night.

13.   Later Tuesday, thunderstorms will erupt along the Northeast seaboard as a cool front presses eastward from the Appalachians.

14.   Low clouds will likely spill eastward over the mountains to parts of the Northeast seaboard before gradually breaking up from southeast New York northward.

15.   Meanwhile, hazy and hot conditions along the Northeast seaboard will yield to clouds and spotty thunderstorms as the front approaches from the west later Sunday afternoon.

16.   Meanwhile, onshore breezes will keep much of the Northeast seaboard cool to mild while the interior warms dramatically.

17.   Meanwhile, sunshine will give way to increasing clouds along the Northeast seaboard as moisture encroaches from the west.

18.   Meanwhile, clouds streaming north ahead of the storm will dim the sun at times along the Northeast seaboard.

19.   Meanwhile, it will be seasonably cool along the Northeast seaboard in the wake of a low-pressure system moving over eastern Canada.

20.   Much of the Northeast seaboard will start with some sunshine, but clouds will increase by late morning or early afternoon.