...There is a slight risk of severe thunderstorms from the Ohio Valley/ Lower Great Lakes to parts of the Northern Appalachians.
...There is a slight risk of severe thunderstorms over parts of the
...Heavy rain possible over parts of the Western Ohio Valley...
A slow moving front extending from the Great Lakes to the Central Plains will advance to the Mid-Atlantic westward to the Middle Mississippi Valley by Sunday evening.
Showers and thunderstorms will develop along and ahead of the boundary from the Northern Appalachians/Great Lakes to portion of the Western Ohio Valley will move to the Mid-Atlantic while extending westward to the Ohio Valley on Sunday.
Upper-level energy will induce a wave of low pressure over the western end of the front in the Northern High Plains. The energy will trigger showers and thunderstorms, with moderate rain at times, over portions of the Northern/Central Plains that will move southeastward to parts of the Middle Mississippi Valley and the Western Ohio Valley by Sunday evening.
Meanwhile, upper-level energy over the Central Gulf Coast and the
Southeast/Eastern Gulf Coast will produce areas of showers and
thunderstorms over the region through Sunday morning.
In addition, monsoonal moisture and diurnal heating will trigger showers/ thunderstorms over parts of the Southwest/Great Basin and parts of the Southern Rockies/Lower Rio Grande Valley Through Sunday.
Also on Sunday, another area of upper-level energy over South-Central Canada will move southeastward into the Northern High Plains/Northern Plains producing showers and thunderstorms over the area on Sunday.