Puget Sound Convergence Zone
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The Puget Sound Convergence Zone (PSCZ) is a meteorological phenomenon that occurs over Puget Sound in Washington. It is formed when the large-scale air flow splits around the Olympic Mountains and then converges over Puget Sound. This convergence generally occurs between north Seattle and Everett and can cause updrafts and convection, which leads to a narrow band of precipitation. This is evidenced by the 140-180+ inches (356 cm-457+ cm) of precipitation over Glacier Peak to the east of Puget Sound.
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