A weather alert was issued by the National Weather Service on Friday at 6:51 a.m. for dense fog until 9:45 a.m. for Northern Clinton, Northern Centre, Southern Centre, Northern Lycoming, Southern Clinton and Southern Lycoming as well as Warren, McKean, Potter, Elk, Cameron, Clearfield, Blair, Huntingdon, Bedford, Fulton, Tioga, Sullivan, Union, Snyder, Montour, Northumberland and Columbia counties.

"Locally dense fog formed early today throughout the valleys of Central and Northern Pennsylvania, as a result of clearing skies, near calm air and a large difference of around 20 degrees between the air, river and stream temperatures. The fog will reduce the visibility below one quarter of a mile in some places. Allow extra time to travel to work or school this morning, and ensure that you kee

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