The National Weather Service has issued a freezing fog advisory for the Tri-Cities through 3 p.m. today.
Patchy fog in the Mid-Columbia was expected to become more widespread late Thursday and to persist through much of today, according to the weather service.
Drivers are warned to watch for icy places on roadways that are otherwise clear, including Interstates 84 and 82, and Highway 11 between Pendleton and Walla Walla.
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