The National Weather Service issued a dense fog advisory at 5:53 a.m. on Friday in effect until 10 a.m. for Westmoreland Ridges as well as Allegheny and Westmoreland counties.

The weather service says to expect, "Visibility one quarter mile or less in dense fog."

"Low visibility could make driving conditions hazardous," says 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

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 possible, consider delaying your trip.

If drivi

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