At 4:24 a.m. on Wednesday, the National Weather Service released a dense fog advisory in effect until 9 a.m. for Westmoreland Ridges and Fayette Ridges as well as Allegheny, Westmoreland and Fayette counties.

The weather service adds to prepare 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."

Guidance from the weather service for navigating foggy conditions

If a dense fog advisory is issued for your area, it means that widespread dense fog has developed and visibility often drops to just a quarter-mile or less. These conditions can make driving challenging, so exercise extreme caution on the road, and if

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