Special Weather Statement issued September 17 at 3:41AM MDT by NWS

…PATCHY DENSE FOG DEVELOPING THIS MORNING… Patchy, locally dense, fog has developed this morning near the HWY-14 corridor, Missouri/James River Corridors, and in portions of northwestern IA. Visibility may drop to two mile or less at times this morning. Expect visibility to improve after daybreak into the mid morning.