Living in the Seattle area has always meant having interesting weather. One of the most unique weather features of our area is the Puget Sound Convergence Zone. Weather from the north (often "modified Artic air" or "Frazier River Valley air" or just cooler canadian air) meets warmer, southern air. The two air masses are channeled between the Olympic range to the west and the Cascade range to the east and when these two air masses meet, it usually happens in an area just north of Seattle and just south of Everett, or often generalized as the "Snohomish/King County Line". What a perfect location for a weather buff like myself to live! Here is a very simpified explanation of what usually goes on to create a PSCZ:
Today a minor snow forecast was made for the puget sound lowlands, with most of the snow set to fall in the PSCZ. This morning, as predicted, the PSCZ set up and its almost a textbook version of the affect:
Here's a snapshot from my webcam this morning:
Here are webcam images from a range of about 20 miles from north to south:
And here's a WSDOT webcam from Totem Lake/I-405 just 2 miles to the south of my location, showing no snow!
164th and I-405, traffic is a cluster (about 8 miles north):
And just north in Everett, sunny and clear, 15 miles to the north: