Effective: 2021-07-24 04:16:00 CDT Expires: 2021-07-24 09:00:00 CDT Urgency: Expected Severity: Minor Certainty: Observed Target Area: Colbert; Cullman; DeKalb; Franklin; Jackson; Lauderdale; Lawrence; Limestone; Madison; Marshall; Morgan Patchy Dense Fog will impact portions of the Tennessee Valley early this morning Patchy Dense Fog has developed across portions of the Tennessee Valley early this morning. Although visibilities are generally in the 3 to 5 mile range, locally dense fog is occurring in many river valleys and other locations near large bodies of water. Visibility reductions below one quarter of a mile are expected in these areas, which include the Tennessee River, Elk River, Paint Rock River, Lake Guntersville and Big Wills Creek. Motorists are urged to drive with extreme caution, as visibilities will vary significantly given the patchy nature of the fog. Use low beams, reduce driving speed, and allow for plenty of room between you and other cars. The fog should begin to burn off between 8 and 9 AM CDT. Stay tuned to NOAA Weather Radio, or a favorite local media outlet, for further statements or updates from the National Weather Service in Huntsville.