Classic low centered over the great lakes with a trailing cold front, dry slot behind the moisture trail in from the gulf due to the lack of dewpoint activity in the slot, drawing gulf moisture up and to the northeast along and ahead of the front. Absolutely coastal fog off the west coast, and of course, the impact of the mountains creating lift and drying out the airmass from the west and downslope channeling the focus of the frontal activity to the east. Bet if you looked at the TAFS, FA's and WIND charts for the regions, you could see this phenomenon by looking at those data
Can winter be far behind?