On Friday at 4:19 a.m. the National Weather Service issued a dense fog advisory in effect until 9 a.m. for Forest, Clarion, Allegheny, Armstrong, Washington, Greene, Westmoreland and Fayette counties.

The weather service adds to be ready for, "Visibility one quarter mile or less in dense fog."

"Low visibility could make driving conditions hazardous," explains the weather service. "If driving, slow down, use your headlights, and leave plenty of distance ahead of you."

Fog safety: Tips from the weather service for safe travels

When a dense fog advisory is issued for your area, it means that widespread dense fog has developed and visibility can plummet to a quarter-mile or less. These conditions pose challenges for travel, so exercise extra caution on the road or consider postponing your

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