Widespread Fog, Locally Dense, With Potentially Slick Roadways This Morning... Widespread fog has developed this morning with visibilities generally around 1 miles or less. Localized dense fog with visibility down to 1/4 mile will be possible. Localized spots where temperatures are near freezing, the fog and light drizzle could lead to some slippery stretches on untreated roads, especially shaded or snow-packed back roads. If driving, slow down, use low-beam headlights, and leave plenty of distance ahead of you.