A front will aid in triggering showers and thunderstorms over parts of
the Mississippi Valley...
Low along the Mid-Atlantic Coast will produce rain and drizzle over the
A front extending from the Upper Great Lakes roughly southwestward to the Southern Plains will move eastward to the Lower Great Lakes/ Central Gulf Coast with the boundary extending westward to the Central Rockies by Sunday evening. Showers and thunderstorms will develop along and ahead of the boundary from the Upper Great Lakes to the Lower Mississippi Valley, that will weaken by Saturday evening. Rain will develop along the front over the Upper Great Lakes by Saturday evening that will extend southward to the Ohio Valley by Sunday morning, moving eastward to the Lower Great Lakes /Central Appalachians by Sunday evening.
Moisture flowing northward out of the Western Gulf of Mexico will move
over the Southern Plains that will produce showers and thunderstorms over the area through Sunday evening. The front will begin to move northward as a warm front on Sunday as upper-level jet energy aids in directing the showers and thunderstorms to move northward over the Central/Southern High Plains.
Meanwhile, upper-level energy will dig an upper-level trough over the
Pacific Northwest into the Great Basin by Sunday. The energy will trigger scattered rain and higher elevation snow over parts of the Northern Rockies/Northern Intermountain Region on Saturday.
As more moisture moves northward over the Plains, some of the moisture will move westward into the Northern/Central Rockies as the upper-level energy digs farther southward. The moisture and energy will produce rain and higher elevation snow over parts of the Northern/Central Rockies and the Great Basin, along with the Northern High Plains by Sunday evening.
Elsewhere, low pressure and onshore flow off the Atlantic will produce light rain and drizzle over parts of the Mid-Atlantic through Sunday morning. The area of light rain and drizzle will move southward to the Carolina Coast by Sunday evening.