Facts about Fog
- 09
Upslope fog forms when moist air is forced up a mountain slope, cools adiabatically, and reaches its dew point, making it common in the Appalachian and Rocky Mountains.
- 08
Fog reduces visibility enough to cause approximately 38,000 vehicle accidents annually in the United States, making it a leading weather-related traffic hazard.
- 07
Coastal regions like Newfoundland experience fog on approximately 120 days per year due to the collision of warm Gulf Stream waters with cold Labrador Current air masses.
- 06
Freezing fog deposits rime ice on surfaces at rates up to 10 centimeters per hour, creating hazardous ice accumulation on power lines, aircraft, and roads in mountainous regions.
- 05
Radiation fog develops when ground-level air cools below its dew point on clear, calm nights, making it the most common fog type in inland valleys and mountainous regions worldwide.
- 04
Advection fog forms when warm, moist air moves horizontally over cooler water surfaces, a process responsible for the persistent summer fogs blanketing coastal California and Oregon.
- 03
In the San Francisco Bay Area, the Karl the Fog mascot has been an official character since 2010, with its own Twitter account boasting over 300,000 followers.
- 02
Stratus clouds forming within 200 meters of the ground are technically classified as fog by meteorologists, reducing visibility to less than 1 kilometer.
- 01
During the 1952 Great Smog of London, visibility reduced to 1 meter and approximately 12,000 people died from respiratory complications.