A series of storm systems will track into the Pacific Northwest starting later Thursday and extending through all of next week.
These storms will be intense at times, with ample amounts of moisture to work with due to a constant flow of moisture from the tropical Pacific called the Pineapple Express. The storms will hit the same general areas from eastern and northern California to western portions of Oregon and Washington, as well as southwestern British Columbia, Canada.
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https://www.freightwaves.com/news/prolonged-stormy-pattern-to-slam-pacific-northwest