On Saturday at 7:06 a.m. the National Weather Service released a dense fog advisory in effect until 9 a.m. for Lawrence, Butler, Beaver and Allegheny counties.

The weather service says to anticipate, "Visibility one to two miles in dense fog."

"Low visibility could make driving conditions hazardous," states 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

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 trip if possible.

If you must venture out in

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