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 Chasing Rainbow. Chasing Rainbow.
While I was busy working, suddenly I turned my head towards the window to see a perfect rainbow and a cruise ship moving fast towards it. Frantically I grabbed my camera and ran to the balcony to take the shot just when the ship appeared to be entering the rainbow.
YouNews Seattle Couple Embraces Seattle Storm Seattle Couple Embraces Seattle Storm
A lot of guests had trouble getting to Nick and Jane's wedding, but there seemed to be a magical bubble around the wedding itself - sunny and only a few big gusts while safe in the church... until well into the cozy inside Broadmoor Golf Club reception.
YouNews Coudy and windy afternoon Coudy and windy afternoon
I took this photo this afternoon at Kerry Park. It was windy, cloudy and a few drizzles falling at times.