An atmospheric river of Pacific moisture brought heavy rain to the East Slopes of the Cascades on the 21st and 22nd of October. 52 inches of rain from the morning of the 21st to the morning of the 22nd.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS OTX wrote it up.
An atmospheric river of Pacific moisture brought heavy rain to the East Slopes of the Cascades on the 21st and 22nd of October. The Steheken COOP station reported 2.52 inches of rain from the morning of the 21st to the morning of the 22nd. 2.15 inches was recorded at Dryden, and 1.30 inches at Chelan. This rain saturated the ground and created a debris flow across the South Lake Shore Road along Lake Chelan.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Spokane, WA wrote its last area forecast discussion before the first event at Oct 22, 4:15 AM PST, 1 hour 45 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
1 debris flow. Local standard time, as filed.
Heavy rain produced a debris flow across South Lake Shore Road at Slide Ridge near Manson. A 16 foot wide slide of mud, logs and rocks temporarily closed the highway.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2017Every state in 2017This day in weather historyWarnings in Washington, October 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 723952.