The dense fog that's enveloped the region, creating hazardous driving conditions, according to the National Weather Service.
"If driving, slow down ... use your low-beam headlights and leave plenty of distance ahead of you in case a sudden stop is needed," the weather service said.
The mild air over the region this afternoon, combined with moisture from this morning's rain is being cooled by the deep snowpack to form the dense fog, according to the NWS.
The NWS forecast has the fog beginning to dissipate after 2 a.m. Tuesday morning.
Here's the latest forecast:
- Tonight: Widespread dense fog before 2am. Otherwise, mostly cloudy, with a low around 33. West wind 7 to 10 mph.
- Tuesday: Mostly sunny, with a high near 42. West wind 8 to 16 mph.
- Tuesday Night: Mostly clear, with a low around 26. West wind 11 to 15 mph.