Sky cover a little tricky Saturday with southerly flow around departing high and ahead of the approaching front.
Looks like there can be areas of clouds for a time Saturday morning, then mid and high clouds increase and thicken as we head into Saturday afternoon. Not too bad for the first day before the start of autumn at 4:44 p.m. Sunday as far as temperatures go, but the front will bring rain mid to late afternoon on into the first half of Saturday night, then breezy cooler weather Sunday.
There could be an isolated shower coming up in the southerly flow before the 3-4 p.m. time frame at BWI, but the main action will come in right ahead of and with the front probably and pretty much will be a band of rain, some heavy, coming across the area for about 6-8 hours. Could be some rumbles of thunder on the leading edge, but overall instability not really there. Overall, rainfall amounts should generally be in the 0.75-1.50 inch range with the highest amount north of Baltimore and the lower amounts south.