Heavy Snow — Cascades of Snohomish and King Counties, Washington

2020-11-12 to 2020-11-14 · Cascades of Snohomish and King Counties, Washington

Event narrative

Heavy snow began to fall in the Central Cascades around 7pm on Nov 12. By 11pm, WSDOT stated the I-90 was closed in both directions around MP 47/Denny Creek due to multiple vehicle spinouts. Around midnight, WSDOT announced the reopening of westbound lanes with chains required. By 4am on Nov 13, I-90 was open in both directions, with snow continuing and overall lighter accumulations.

Wider weather episode

A series of storm systems traversed the Pacific Northwest in mid November, resulting in heavy mountain snow and travel impacts.

Source: NOAA Storm Events Database, event_id 930644. Narrative written by the NWS forecast office that issued the report.