The National Weather Service issued a report at 10:40 p.m. on Thursday for fog until Friday at 9 a.m. for Westmoreland Ridges, Fayette Ridges and Higher Elevations of Indiana as well as Mercer, Venango, Forest, Lawrence, Butler, Clarion, Jefferson, Beaver, Allegheny, Armstrong, Washington, Greene, Westmoreland, Fayette and Indiana counties.

"Areas of fog have developed across portions of eastern Ohio through western Pennsylvania that are likely to continue into Friday morning. Most areas will experience visibility restrictions between a half mile to one mile, but localized spots could be dense at a quarter of a mile or less. Use caution if traveling through the overnight period, and prepare for rapid changes in visibility over a short distance. The fog is expected to gradually dissipate b

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