A system continues east today and tonight with another one getting going in the southern High Plains through the weekend.
The first system affects the Ohio River Valley, Southeast, Mid-Atlantic, and southern New England today and tonight producing widespread rains, some heavy at times with a lot of these areas picking up over an inch before it is all done. A few isolated severe storms are possible in these regions, but the highest chances will come near a dry line that will be draped across eastern NM and west TX.
The second system will slowly get going over the weekend in the Southern High Plains where the dryline will stay in place along with developing warm and cold fronts in the vicinity of an organizing area of low pressure. A few storms will continue to be possible across the Southern High Plains southward into west TX near the dryline. This activity will have a chance to grow and build east producing heavy rains each night possibly heading into southern NE, KS, and OK Saturday overnight into early Sunday, and then on Sunday night building east into southwest OK, TX panhandle, and north-central TX overnight Sunday. Further north a weak front will bring mainly isolated to scattered light shower chances to the Dakotas and parts of the Upper Midwest.