The cold weather over the weekend highlighted the temperature “convergence zone” in the Puget Sound.  This video from Atmospheric Sciences shows how clouds flow across the lower airspace above the Puget Sound, as the air warmed by the water is displaced by the colder air flowing off of the land.

https://youtube.com/watch?v=KCq5lLSX9WA%3Ffeature%3Dplayer_embedded