539 PM PDT Thu May 20 2021 Cascades of Whatcom and Skagit Counties- Cascades of Snohomish and King Counties- 539 PM PDT Thu May 20 2021 .NOW...Scattered thunderstorms have developed in the North Cascades of Whatcom and Skagit county. These storms will move slowly southwest and dissipate in the next hour. Brief heavy rain and small hail could accompany these storms.