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Puget Sound's Wild Spring: Convergence Zones & Tornado Threats
14 Apr
Summary
- Spring brings frequent Puget Sound Convergence Zones with heavy rain.
- Unseasonably cool temperatures expected mid-week, with frost likely.
- Western Washington averages two tornadoes per year, mostly in April/May.
The Puget Sound region experiences a distinctive weather phenomenon during spring: the Puget Sound Convergence Zone. This occurs when westerly air flows from the Pacific Ocean wrap around the Olympic Mountains and collide, creating clouds and rain, most frequently impacting south Snohomish and north King Counties.
This week's forecast includes the Convergence Zone on Monday and Wednesday, with a Pacific frontal system bringing rain Tuesday. Following Wednesday's showers, temperatures will dip to unseasonably cool levels, with highs in the 50s, about five degrees below average. Frost is possible in colder areas, and mountain snow levels will drop significantly.
Spring is also peak season for thunderstorms and tornadoes in western Washington. While most tornadoes are weak, averaging two per year, the region has experienced stronger F3 tornadoes in the past. Residents are advised to seek shelter indoors during thunderstorms and interior rooms or basements during tornado threats.
