STATE COLLEGE — Motorists are urged to use caution as dense fog blankets parts of Pennsylvania.

The National Weather Service in State College says a dense fog advisory is in effect until 10 a.m. Wednesday for southern Centre, Blair, Huntingdon, Mifflin, Juniata, Somerset, Bedford, Fulton, Franklin, southern Clinton, southern Lycoming, Union, Snyder, Montour, Northumberland, Columbia, Perry, Dauphin, Schuylkill, Lebanon, Cumberland, Adams, York and Lancaster counties.

The fog is especially thick in the valleys.

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