Dense Fog Advisory in Pennsylvania Limits Visibility to ¼ Mile Until Thursday AM—Drive Slow, Use Headlights for Safety

The National Weather Service has issued a dense fog advisory affecting several counties in Pennsylvania until Thursday morning. This advisory covers Higher Elevations of Indiana, Mercer, Venango, Forest, Lawrence, Butler, Clarion, Jefferson, Armstrong, and Indiana counties. Visibility during this period is expected to drop to a quarter mile or less in dense fog conditions.

The weather service warns that low visibility can create hazardous driving conditions. Motorists are urged to slow down, use low-beam headlights, and maintain a safe distance from other vehicles to avoid collisions.

Areas Under Advisory

1. Higher Elevations of Indiana
2. Mercer County
3. Venango County
4. Forest County
5. Lawrence County
6. Butler County
7. Clarion County
8. Jefferson County
9. Armstrong County
10. Indiana County

These areas continue to experience dense fog that significantly reduces visibility on roadways. Travelers should exercise extreme caution while driving through these regions.

Fog Safety Guidelines

When dense fog reduces visibility to a quarter mile or less, safety precautions become critical. The weather service recommends the following measures to protect drivers and passengers:

1. Reduce Speed: Slow down and allow for additional travel time to reach destinations safely.
2. Use Low-Beam Headlights: Low beams help improve vehicle visibility to others and reduce glare.
3. Avoid High Beams: High beams can cause light to reflect back, impairing vision rather than improving it.
4. Maintain Safe Distances: Leave ample space ahead to react to sudden stops or changes in traffic flow.
5. Stay in Your Lane: Use lane markings as visual guides to avoid inadvertent lane drifting.
6. Use Hazard Lights When Necessary: If visibility nears zero, activate hazard lights and pull over to a safe location.

In locations without designated parking or safe pull-off zones, drivers are advised to move their vehicles as far from traffic lanes as possible. Once stopped, drivers should turn off all lights except hazard flashers, engage the emergency brake, and release the brake pedal to limit tail light visibility. This reduces the risk of rear-end collisions.

Adhering to these precautions will enhance safety during the dense fog advisory and help prevent accidents. Motorists are encouraged to stay informed of updated weather conditions and adjust travel plans accordingly.