Overview

• National Weather Service advisories were issued late Thursday, with Pennsylvania posted at 11:14 p.m. EDT and Cortland County at 11:23 p.m.
• The Pennsylvania advisory runs until 9 a.m. EDT Friday and includes Northern and Southern Lycoming, Tioga, Sullivan, Montour, Northumberland, Columbia, Lebanon, York, Lancaster, and Schuylkill counties.
• The Cortland County, N.Y., advisory is in effect until 8 a.m. EDT Friday.
• Forecasters warn visibility may drop to a quarter mile or less, creating hazardous driving conditions in affected areas.
• Safety guidance calls for slower speeds, low‑beam headlights or fog lights, extra following distance, avoidance of high beams, and pulling over with hazard lights if visibility nears zero.