41.   Cooler air will arrive along the Northeast seaboard as high pressure builds across southern Canada.

42.   Drier air will arrive across the Northeast on Tuesday as a cool front moves off the East Coast.

43.   Drier air will arrive in these areas by early Tuesday as high pressure expands south from the Great Lakes.

44.   Drier air will arrive by Sunday afternoon.

45.   Dry, chilly air will arrive in the wake of the low Thursday night and Friday.

46.   During the afternoon and evening, the rain showers will change to snow showers as cold air arrives from the southwest.

47.   Early clouds will yield to ample sunshine across the northern Middle Atlantic coast as drier air arrives from the Great Lakes region.

48.   Drier air will arrive in the northern Rockies and Dakotas as winds from the west increase.

49.   Elsewhere, slightly cooler air will arrive in the south-central Plains under mainly sunny skies as high pressure builds south from Canada.

50.   During winter, when the coldest air arrives in the region, the supply of moisture is meager.