What Makes Fog?

Tools

By By Steve Pool

SEATTLE - There are two main types of fog, and the Northwest gets both varieties.

Ground fog usually begins on clear nights. As the temperature drops, the air cools to where it becomes totally saturated. The air condenses into water droplets, which we see as fog.

Advection fog is created from a warm air mass that moves over a colder area. This is common here in spring and summer. Over on the coast, warm air reacts with cooler air near the ocean water. It then cools and condenses, creating fog. It's a near-daily occurrence on the coast, but that fog can get carried into the Puget Sound region by the overnight marine winds, allowing our days start with fog or a low overcast.

For More Information:

KOMO Weather FAQ

Your Photos

YouNews Dungeness R footnhalf below flood stage Dungeness R footnhalf below flood stage
The Dungeness River flowed to within a foot and a half of flood stage this Black Friday. Started logs and trees moving downstream into the bay.
YouNews The Great Wheel The Great Wheel
Spent Thanksgiving with family and friends at Fisherman's on Pier 57.
YouNews Best Buy's Holiday Meals Best Buy's Holiday Meals
Every year Retail businesses go through the same event of working on Thanksgiving Day. But at least with that job, Corporate will offer a good meal to the employees that are told it is mandatory to work on that Holiday.