On Wednesday at 6:13 a.m. the National Weather Service issued a dense fog advisory in effect until 9 a.m. for Western Chester, Eastern Chester, Western Montgomery, Eastern Montgomery, Upper Bucks and Lower Bucks as well as Berks, Lehigh, Northampton, Delaware and Philadelphia counties.

The weather service adds to anticipate, "Visibility of one quarter mile or less in dense fog."

"Low visibility could make driving conditions hazardous," adds 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

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