Summer Storms Rage: 70 MPH Winds Lash Washington

On August 29, 2015, western Washington was battered by the strongest summer windstorm on record. Wind gusts reached speeds as high as 70 mph, causing widespread disruption across the region.

The powerful winds toppled trees and branches, leading to significant damage. Over half a million customers lost power, and many roads, including major routes like I-405, were blocked by fallen debris. Tragically, two people died as a result of falling trees and branches.

This summer storm was highly unusual, as such intense winds are typically associated with fall or winter. The presence of leaves on trees amplified the effect of the winds, making them act like sails. Despite being well-forecast, many residents were caught off guard on the August weekend.

Looking ahead, current forecasts for the upcoming weekend predict only light showers with winds between 10 to 20 mph. A subsequent weather system is expected to bring more meaningful rainfall by Tuesday night into Wednesday. Cooler temperatures are anticipated, with highs in the mid-60s to lower 70s, which will also help mitigate wildfire smoke.

The exceptional nature of the 2015 storm serves as a reminder of the importance of weather preparedness, as similar events, though rare, can occur.