Overview

• New advisories issued before dawn cover central, southwest, and northern tier counties including Centre, Lycoming, Allegheny, Westmoreland, Warren, McKean, Potter, and Tioga.
• Most advisories run through 9 a.m., with a separate alert for Warren, McKean, Potter, and Tioga valid until 11:30 a.m.
• An updated advisory for southwest Pennsylvania is in effect from 5 a.m. to 9 a.m. for higher elevations and surrounding counties.
• Visibility is reduced to a quarter mile or less in places, with sharp changes over short distances as clear skies and light winds favor radiation fog.
• Forecasters urge drivers to slow down, use low-beam headlights, increase following distance, and expect improving conditions by mid-morning as the fog lifts.