A thick fog settled in overnight, triggering weather alerts throughout northeast Ohio early Wednesday.

With visibility ranging from near zero to a quarter mile, the National Weather Service put most of the Channel 3 viewing area under a Dense Fog Advisory until 9 a.m.

A handful of schools even delayed the start of classes by two hours due to the foggy conditions.

LIST | Current weather alerts

Authorities urged drivers to slow down, use low beams and leave plenty of distance from the vehicle in front.

The impacted counties included:

  • Ashland
  • Carroll
  • Coshocton
  • Columbiana
  • Cuyahoga
  • Erie
  • Geauga
  • Holmes
  • Huron
  • Lake
  • Lorain
  • Medina
  • Mahoning
  • Ottawa
  • Portage
  • Richland
  • Sandusky
  • Seneca
  • Stark
  • Summit
  • Trumbull
  • Tuscarawas
  • Wayne