Shower and storm activity is expected from the Plains to the east coast through the weekend.
First, a trough will move off the east coast today and will produce scattered showers and storms up and down the coast. The majority of this activity should be down by this evening or early overnight, and a few of the storms from SC to southern NJ could be severe.
Further west an upper-level cut-off low will meander around TX and the Southern Plains, and this feature will produce isolated to scattered showers and storms. There isn't much of a chance for this activity to become severe with mainly heavy downpours the main threat.
Finally, the better chances for severe storms will come across parts of the Northern Plains, and Northern High Plains as disturbances track through this region ahead of an upper trough in the Pacific Northwest. The best chances this afternoon will be mainly in north-central and northeast MT, northern ND this evening and could make it into northern MN during the overnight. Saturday the best chances will be from southeast MT to north-central ND during the evening with a chance at affecting northwest MN during the overnight. And then Sunday confidence is lower in the risk for severe storms at this time, but maybe possible from northwest SD to northwest MN.