“Very strong El Niños will cause the trough to shift further south with the average storm track position moving into Southern California,” the National Weather Service says. “During these times, rainfall in California can be significantly above normal, leading to numerous occurrences of flash flood and debris flows. With the storm track shifted south, the Pacific Northwest becomes drier and drier as the tropical moisture is shunted south of the region.”
https://www.washingtonpost.com/news/post-nation/wp/2015/11/02/el-nino-could-kill-hundreds-of-homeless-californians-who-refuse-to-leave-flood-zones/
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