Davenport, Iowa – Drivers across eastern Iowa and western Illinois could face dangerous visibility levels overnight as dense fog develops along the Mississippi River corridor, with impacts likely lingering into early Sunday.
According to the National Weather Service Quad Cities office, saturated ground from recent rainfall combined with calm winds has increased confidence in fog development between midnight and 3 a.m. Sunday. The highest risk area forms an arc from Clinton, Iowa, through Princeton, Illinois, and extends southwest toward the Mississippi River.
Cities including the Quad Cities, Galesburg, and Macomb are within the zone of concern. Visibility may fall below half a mile in some areas, with fog potentially persisting past sunrise. Drivers are urged to use low-beam headlights, allow extra travel time, and prepare for rapidly changing visibility.
This fog event follows a pattern seen in previous early summer moisture surges and could impact early-morning travel on key routes like I-80 and U.S. 67.
Confidence in fog development continues to rise across the shaded region. Further updates may be issued if fog conditions intensify or expand.
