Four inches of slushy snow accumulation fell at Hyak, just below Snoqualmie pass. This was the first significant snow for the pass this winter and multiple spin-outs resulted in Interstate 90 being closed in both directions for 2 hours.
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 PDT wrote it up.
Four inches of slushy snow accumulation fell at Hyak, just below Snoqualmie pass. This was the first significant snow for the pass this winter and multiple spin-outs resulted in Interstate 90 being closed in both directions for 2 hours.
1 winter weather. Local standard time, as filed.
Interstate 90 over Snoqualmie Pass was closed for 4 hours after multiple spin-outs due to 4 inches of wet and slushy snow accumulation.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2018Every state in 2018This day in weather historyWarnings in Washington, November 2018
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: 790207.