21.   Much more pleasant weather is expected along the Atlantic seaboard as drier air streams into the region on an active breeze from the northwest.

22.   On Monday, showers and thunderstorms will be most common from the Mississippi Valley to the southern Great Lakes as humid air streams north from the Gulf of Mexico.

23.   On Saturday, severe storms are possible in the East as warm, moist air streams north.

24.   Patches of freezing rain will develop in some valleys of northern New England where warm, moist air streams above below-freezing air trapped in the valleys.

25.   Potent thunderstorms will flare up across the lower Mississippi Valley as a steady plume of humid air streams northward from the Gulf of Mexico.

26.   Rain and sleet will mix with the snow on Cape Cod and the islands as milder air streams into coastal New England on gale force winds from the northeast.

27.   Showers and thunderstorms are due in the southern Mississippi Valley as warm, moist air streams north from the Gulf of Mexico.

28.   Snow will streak eastward across the northern Middle Atlantic and southeastern New England states Friday as mild, moist air streams northward over a dome of cold air.

29.   The arctic air mass that has tenaciously gripped the northern Plains this week will begin to slightly loosen its grip as Pacific air streams eastward.

30.   The merging of two moist air streams over the central and southern Appalachians will lead to widespread showers and thunderstorms.