Flash Flood — Chelan, Washington

2019-07-02 · near Lakeside, Chelan, Washington

Event narrative

Highway 150 between Chelan and Manson was closed due to a small mudslide caused by heavy rain. The road re-opened after a few hours when highway crews cleared the mud.

Wider weather episode

During the afternoon of July 2nd numerous slow moving thunderstorms containing heavy rain formed near the center of an upper level low pressure over the western Columbia Basin and the east slopes of the Cascade Mountains. A rich moisture feed wrapping around this upper low pressure allowed some of these storms to produce heavy rainfall over limited areas. A spotter near Waterville reported 1.29 inches of rain from a series of thunderstorms training through the area. Several reports of flash flooding were received from the region with multiple roads blocked by flowing water, mud and rocks.

View location on OpenStreetMap → (47.8599, -120.0717)

Source: NOAA Storm Events Database, event_id 834016. Narrative written by the NWS forecast office that issued the report.