Three features will bring active weather to parts of the country through the weekend mainly from the Plains to the east coast.
First, a nearly stationary front will be draped from the Central Plains to the Great Lakes during much of the period and extending into the Northeast by Sunday. Initially an area of showers and storms early today will build through the Great Lakes into the Northeast tonight. Further west in the vicinity the front redevelopment is anticipated from eastern PA to southern IA mainly by late afternoon or evening, and a lot of the same areas will see a similar scenario on Saturday in particular from central IL to New England. Severe storms are possible with this activity with better chances today and more of a marginal on Saturday.
Next, an upper trough builds into the Northern Plains on Sunday initially producing scattered showers and storms Saturday evening and overnight in the Dakotas, then coverage increases into Sunday in MN and IA, WI during the afternoon, upper and lower MI in the evening, and northern IN during the overnight.
Finally, a tropical system in the Gulf is expected to come inland in the southeast LA/southern MS area late tonight or early Saturday affecting southeast LA, eastern and southern MS, much of AL and GA, and then parts of the Carolinas by Sunday. It is likely this system becomes a tropical storm and would become Claudette.