Areas of freezing fog are expected to continue until about 11 a.m. today.
Visibility might be less than a quarter mile in some places, and drivers should be prepared for a sudden reduction in visibility and icy spots on roadways, according to the National Weather Service.
Similar fog is expected in the Walla Walla Valley and the Yakima Valley, according to the National Weather Service.
The National Weather Service has also issued a warning about air stagnation through Tuesday. Pollution may increase because of limited air movement, according to the weather service.