At 5:53 a.m. on Friday, the National Weather Service issued an updated dense fog advisory in effect until 10 a.m. for Higher Elevations of Indiana as well as Mercer, Venango, Forest, Lawrence, Butler, Clarion, Jefferson, Beaver, Armstrong, Washington and Indiana counties.

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

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

Navigating fog: Safety tips by the weather service

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

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