Iowa Weather Alert: Dense Fog Expected Overnight Could Cut Visibility to Under 1 Mile

DES MOINES, IA — Drivers across Iowa should prepare for dense fog forming overnight that could make early Thursday travel hazardous, according to the National Weather Service (NWS) in Des Moines.

Fog Timing and Conditions

Meteorologists say fog will become widespread toward sunrise Thursday, affecting most of the state.

• Visibility will typically be reduced to a few miles.
• In northern Iowa, some locations could see visibility drop to under one mile.
• The fog is expected to lift and dissipate by around 9 a.m. Thursday.

Travel Impacts

Authorities warn that the fog could cause:

• Slower commutes on major interstates and highways
• Delays for early-morning travelers
• Sudden low-visibility patches in valleys, low-lying areas, and rural roads

The NWS recommends drivers:

• Slow down when entering fog
• Allow extra travel time
• Use low-beam headlights instead of high beams

Weather Setup

Cool overnight temperatures combined with calm winds will increase the likelihood of fog formation, especially in river valleys and along interstate corridors.

Motorists planning early travel Thursday morning are encouraged to monitor local forecasts for any updates and exercise caution.

Stay with ChicagoMusicGuide.com for continuing Iowa weather updates and safety information.