A thick blanket of fog has settled over Ohio’s three largest cities—Cleveland, Columbus, and Cincinnati—causing hazardous driving conditions and slowing down morning commutes. The National Weather Service (NWS) has issued a Dense Fog Advisory, warning that visibility could drop to a quarter-mile or less in some areas, making travel extremely dangerous.
The advisory is expected to remain in effect until mid-morning on Thursday, when temperatures rise and sunlight begins to break apart the fog. Until then, drivers are urged to take extreme caution on the roads to avoid accidents and unnecessary risks.
What’s Causing the Thick Fog?
Fog forms when moist air near the ground cools rapidly, condensing into tiny water droplets that suspend in the air. This particular fog event is being fueled by calm winds and high humidity levels, which prevent the mist from dispersing. As a result, major roadways—including highways and interstates—are seeing drastically reduced visibility, making even short trips more hazardous.

What to Expect in Each Affected City
- Cleveland: Drivers navigating Cleveland’s roads will experience patchy dense fog, especially in low-lying areas, bridges, and near bodies of water. Visibility may change quickly from one area to the next, making travel unpredictable.
- Columbus: The Ohio capital is also covered in thick, patchy fog, which could pose risks along major routes such as Interstates 70 and 71. Sudden drops in visibility make merging and lane changes particularly dangerous.
- Cincinnati: Cincinnati’s urban areas and nearby river valleys are experiencing dense fog, significantly reducing visibility on key highways, including I-75 and I-275. Drivers should take extra precautions, especially on elevated roadways.
Safety Tips for Driving in Dense Fog
Slow Down – Speeding in foggy conditions is extremely dangerous. Give yourself extra time to reach your destination safely.
Use Low-Beam Headlights – High beams reflect off the fog and create glare, making it even harder to see. Stick with low beams or fog lights if your car has them.
Increase Following Distance – Tailgating is especially risky in foggy conditions. Keep plenty of space between your vehicle and the one in front of you.
Minimize Distractions – Stay focused on the road. Avoid using your phone, loud music, or anything else that takes your attention away from driving.
Avoid Sudden Stops – If visibility is poor, brake gently to avoid causing a chain-reaction crash.
When Will the Fog Lift?
Meteorologists predict that the fog will begin to clear by mid-morning as the sun rises and temperatures increase. However, in some low-lying areas and valleys, patches of fog may linger longer, making conditions slow to improve.
Until then, drivers are advised to remain cautious and avoid travel if possible. Those heading out should allow for extra time, follow safety precautions, and stay informed on any updates from local weather services.
Final Warning: Stay Alert and Drive Smart
Dense fog is one of the most dangerous weather conditions for drivers, as it can dramatically reduce reaction times and increase the likelihood of accidents. If you don’t have to be on the road, consider delaying your trip until conditions improve. If you must drive, take it slow, stay focused, and be prepared for rapidly changing visibility levels.