Winter Windstorm 2006

The Hanukkah Eve Wind Storm of 2006 slammed into the Pacific Northwest December 14 – December 15, 2006. It produced storm to hurricane-force wind gusts and heavy rainfall, causing hundreds of millions of dollars in damage and leaving over 1.8 million residences and businesses without power. Large portions of the planted trees in the Seattle metropolitan area were at the end of their lifespan, being some 60 to 70 years of age or more. To compound this, many tree species had shallow root systems that did not extend past the waterlogged soil. The result of these factors was that many thousands of large, old trees easily uprooted and tipped over, frequently with tons of mud captured in their roots, and crashed into homes and power lines.

Source: Hanukkah Eve Windstorm, Wikipedia