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One Frontal Passage Down

Posted: October 17th, 2019

@NWSSeattle

With one frontal passage down and a few more to go, rainfall forecasts are in better agreement. Up to three more inches of lowland rain, occasionally heavy, is likely over the next seven days. Decent amounts of high elevation snow, too.

Since late Monday, SPU’s south-end rain gages have recorded up to a half an inch; north-end gages are closer to a third of an inch. October rainfall at SeaTac is up to 0.78″ (22% of the monthly normal).

It’s typical that we hype first “storm” of the season. The upside is that it gives SPU’s drainage and wastewater crews a chance to prepare, review procedures, etc. It’s been at least seven years since Seattle has experienced an extreme long-duration rainfall event, and weeks like this remind us to be ready.