"Tell people to slow down in the dense fog and be prepared for it to be patchy and visibilities to drop suddenly."

Forecaster Angus Barkhoff says visibility has been down to less than 500-feet in many spots…sometimes down to 200-feet.

He says high-pressure over the area is creating a stagnant mass of cold, moist air…and that's causing all the fog.

"If we had a north wind or even if a storm system came through to mix up the atmosphere then we'd get rid of the fog. But we're not looking at anything for the rest of this work week."

Barkhoff says we'll have late night and early morning fog all week long. Once the fog burns off…usually around 10 AM…it should be sunny with temperatures in the low to mid 60s.