LOCALLY DENSE FOG AFFECTING AREAS NEAR NORTHEASTERN MN AND NORTHWESTERN WI... Areas of locally dense fog will affect areas near northeastern MN and northwestern WI overnight tonight. Visibilities of 1/2 to 1/4 mile have already been observed, which should persist through the overnight hours. Visibilities are expected to improve after sunrise. If traveling early this morning, reduce your speed and use low-beam headlights when encountering foggy areas. A Dense Fog Advisory may be needed. Keep updated on the latest forecast for fog development trends.