A freezing fog advisory has been issued for Crawford County by the National Weather Service. This advisory became effective on Thursday at 5:21 a.m. and will remain in place until 9 a.m.
Conditions and Impact
The advisory warns residents to expect visibility to drop to one quarter mile or less due to freezing fog. The weather service has highlighted potential hazards, especially on bridges and overpasses, where a light glaze of ice may develop. Drivers are advised to slow down, use headlights, and maintain a safe distance from other vehicles.
Understanding Freezing Fog
Freezing fog occurs when fog forms at or below freezing temperatures. In these conditions, tiny liquid droplets in the fog can instantly freeze upon contact with surfaces such as cars and roads. This weather phenomenon can significantly impair visibility, often reducing it to a mile or less.
Formation of Freezing Fog
Both freezing fog and regular fog begin under clear skies. As the Earth’s surface cools, the air loses its ability to hold moisture, leading to the formation of fog. In temperatures below freezing, the moisture remains in liquid form, resulting in supercooled droplets. These droplets can freeze upon contact with surfaces, creating a coating of ice known as rime.
Risks Associated with Freezing Fog
- Driving conditions can become hazardous due to reduced visibility and the formation of black ice.
- Black ice, a nearly invisible layer of ice, poses a significant risk to road users.
- Air travel can also be affected, as ice may accumulate on aircraft surfaces.
Safety Guidelines
To ensure safety during freezing fog conditions, consider the following precautions:
- Stay Alert: Be aware of the increased risk of black ice.
- Reduce Speed: Travel at lower speeds to react appropriately to road conditions.
- Use Low-Beam Headlights: This increases visibility without causing glare.
- Maintain Distance: Keep an adequate distance from other vehicles.
- Follow Lane Markings: Use lane markings to guide your path on the road.
Flight safety is also crucial; ensure that aircraft are treated appropriately to prevent ice accumulation before takeoff. During freezing fog conditions, it’s essential to prioritize safety and exercise caution.
