Special Weather Statement issued December 29 at 12:02PM EST by NWS State College PA

Locally dense fog over the higher terrain of Schuylkill County
will reduce visibilities to a quarter mile or less on Interstate
81. This will lead to drastically changing conditions for anyone
traveling this afternoon.

If traveling, expect rapidly changing conditions and areas of
very poor visibility. Motorists are encouraged to increase
distance between other vehicles and use low-beam headlights to
alert other motorists of your presence.

Conditions are expected to improve later this afternoon as winds
begin to increase, allowing for fog to dissipate by 4 PM.