Ice Fog Basics

Fog forms when the sun causes the air and ground to warm. The change in temperature paired with humidity causes water vapor to condense. During the condensation process, tiny water droplets form and hang in the air. As the temperature rises, the water droplets dissipate and return to their gaseous form. Different weather temperatures cause different types of fog.

Where Does Ice Fog Occur?

While Anchorage occasionally experiences ice fog, it is not considered a major concern compared to other parts of Alaska like Fairbanks. The temperatures in Anchorage typically don’t drop low enough frequently to create significant ice fog conditions; most ice fog occurrences in Anchorage are relatively brief and mild. Ice fog forms when temperatures drop significantly below freezing, usually around -30 degrees Fahrenheit, which is not as common in Anchorage. 

The Alaska interior often deals with ice fog. Although it is becoming less frequent. When temperatures are very low, water droplets in fog are very cold. In addition to temperatures cold enough for ice fog to form, the interior also has sources of water vapor such as open leads in the Chena River, and plumes from the power plants as well as emissions from traffic, heating and industrial processes. Drivers must be extra cautious in ice fog conditions because ice crystals can stick to a vehicle or road easily. When the crystals touch a surface, they can develop an icy surface.

Driving In Freezing Fog

If you find yourself driving in ice fog conditions, slow down and ensure to use your headlights. If your vehicle has fog lights, use them.

– Headlights

Headlights are especially important during foggy weather. Some drivers think high beams are better for foggy conditions, but high beams can reduce visibility. Do not be misled into believing that high beam headlights are good for fog, high beams will reflect off the fog back into the driver’s eyes. If your vehicle has fog lights, use them. The visibility is better for you and other drivers can see your vehicle on the roads. Also be on the lookout for other drivers not using their headlights.

– Slow Down And Take Extra Time

Slow down when driving in fog, it is dangerous to drive at normal speeds. You need the extra time to react to stops or hazards on the roads. Do not follow the vehicle in front of you too closely when driving in fog. Leave an appropriate distance between you and the driver in front of you. Be extra cautious when passing through intersections, slow down and look both ways before crossing heavily fogged intersections.

Further, allow yourself extra time to travel in ice fog conditions and be patient. If ice fog is on the weather radar, try to stay home when possible and avoid driving. In cases where staying home is not an option, be extra cautious.

Remove Distractions

Stay off your phone when you are behind the wheel and stay alert. It is everyone’s responsibility to keep roads safe for everyone else. Talking, texting or recording while driving is dangerous, especially when driving in fog. Turn off music and other distractions. When possible, crack your window to listen for traffic outside so you can be more aware of your surroundings.

If you are in an accident during foggy weather, ensure you pull all the way over so additional accidents do not occur. Turn your flashing lights on and move as far away from the road as possible to avoid additional collisions. When possible, simply stay off the roads and wait for the fog to pass. If you must drive in ice fog, please be safe.

Johnson Law has been helping Alaskans for nearly 30 years. It’s who we are. And while we hope you never need us… We’re here if you do. ~ Doug Johnson

Please call Johnson Law to discuss your case: (907)277-3090 or use our online contact form.

Sources: Reporting From Alaska;  Alaska Climate Research Center; Glossary of Meteorology

Image Source: Alaska Public Media