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Puget Sound Convergence Zone

puget sound convergence zone, puget sound convergence zone map
The Puget Sound Convergence Zone PSCZ is a meteorological phenomenon that occurs over Puget Sound in the US state of Washington It is formed when the large-scale air flow splits around the Olympic Mountains and then converges over Puget Sound This convergence zone generally occurs between north Seattle and Everett and can cause updrafts and convection, which leads to a narrow band of precipitation

A second, weaker convergence zone can occur between approximately Victoria, British Columbia, and Bellingham, Washington, over the San Juan Islands, as a result of southwesterly air blowing from the Strait of Juan de Fuca meeting northerly air moving southward down the Strait of Georgia1


  • 1 Most common locations
  • 2 Events
    • 21 April 18, 2008
  • 3 References

Most common locationsedit

Puget Sound Convergence Zones, variable in both location and strength, tend to form in the general vicinity of central and southern Snohomish and northern King counties in Washington, from Everett to the Northgate neighborhood of Seattle2 The strongest part of the Convergence Zone where the heaviest precipitation falls tends to lie along and adjacent to the King-Snohomish County line so that neither county is left dry The proximity of the Convergence Zone to the King-Snohomish County line is the reason that cities located just north or south of the line, which are located within the rain shadow of the Olympic Mountains, approach Seattle in annual precipitation The effect of the Puget Sound Convergence Zone nearly offsets that of the rain shadow3 Without PSCZ, cities such as Edmonds, Mountlake Terrace, and Lynnwood in Snohomish County and Shoreline, Lake Forest Park, and Bothell in King County would be noticeably wetter than Seattle

The PSCZ has been suggested as the cause of greater precipitation over Glacier Peak relative to other mountains in the Cascades to the east of Puget Sound As there are no weather stations near Glacier Peak, it remains unclear whether that area actually receives greater precipitation than elsewhere in the Cascade Range4


April 18, 2008edit

On April 18, 2008, a strong and very unseasonable snow-producing Puget Sound Convergence Zone storm formed around Everett, and spread south throughout the course of the afternoon and evening5 By evening, the Zone had spread into northern King County, dumping 35 inches 89 mm of snow in Shoreline, and 65 inches 170 mm of snow in Woodinville6 As the Zone slowly sank south of Shoreline into Seattle past NE 145th Street, snow amounts began to taper off The snow-producing part of the Zone ended abruptly at Roosevelt High School, a mere ten blocks north of the beginnings of the University District and the University of Washington community Just north of Roosevelt High School, an inch of snow coated the ground, and due west of the school in the Green Lake neighborhood of Seattle, an inch of snow had also fallen In line with the known "abrupt edge" of the Puget Sound Convergence Zone, areas to the south of this Green Lake-to-Roosevelt High line marked by NE 68th Street, including the U-District, witnessed only a dusting of snow


  1. ^ Mass, Cliff 2008 The Weather of the Pacific Northwest University of Washington Press pp 149–150 ISBN 978-0-295-98847-4 
  2. ^ Scott Sistek October 4, 2006 "What is the Puget Sound Convergence Zone" FAQ KOMO News Retrieved September 8, 2012 
  3. ^ Steve Pool March 13, 2008 "Does The Convergence Zone Mean It Rains More In Lynnwood" FAQ KOMO News Retrieved July 20, 2016 
  4. ^ "Skiing the Cascade Volcanoes: Snowfall and Snowdepth" Amar Andalkar's Ski Mountaineering and Climbing Site Retrieved September 8, 2012 
  5. ^ Scott Sistek April 19, 2008 "Waking to a springtime wonderland" KOMO News Retrieved July 20, 2016 
  6. ^ Scott Sistek April 18, 2008 "Summer is 63 days away Really" KOMO News Retrieved July 20, 2016 

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Puget Sound Convergence Zone

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