February 23rd
Snowfall is not a common occurrence in the Puget Sound lowlands. If we get any, it usually comes between late November and early January. Sometimes we don't even get frost until late December or January. Other parts of the US have been clobbered by repeated waves of heavy snowfall this winter. In the Pacific Northwest, we have tried to keep a low profile, hoping to escape La NiƱa 's attention. When February arrived, we thought we had staved off any chance of snow for the winter, but no such luck. On February 23, 2011 a Pacific low positioned itself off the coast in a perfect location to draw Arctic air down the Fraser Valley into Puget Sound. At the same time, it pushed moisture from the ocean into western Washington. This was a recipe for heavy snowfall and it came very quickly. For a time, 30 miles of Interstate 5 was shut down in Skagit County north of Seattle where drivers where overwhelmed by the volume of snow. Up to 14 in...