This satellite shows a vigorous upper low spinning through the Ohio Valley. As it does...it's sending moisture up along the east coast and it will cause more rain in Mid Atlantic and Northeast through end of week.
Map above is for Thursday evening. Western states continue wet. Central Nice. Storm off New England moves offshore...but low near No.Carolina coast was the storm in Ohio Valley this morning that will deepen and move northeast with wind and rain there on Friday. Below...the various maps and models for this Sunday - Mother's Day. Most models agree that another trof will move across the Northeast with showers...and wind.