Debris Flow — Tuolumne, California

2017-02-10 · near Harden Flats, Tuolumne, California

Event narrative

California Highway Patrol reported a rock slide due to heavy rainfall on Highway 140 east of Ferguson Bridge about 5 miles north northwest of Midpines.

Wider weather episode

A low pressure system spread moisture into Merced County and into Yosemite Park on on the evening of February 9. This system moved southward on the morning of the 10th spreading heavy precipitation across the Yosemite Park area, the Mariposa County foothills and the rural areas of Merced County to the southeast of Merced. Some thunderstorms broke out that afternoon bringing additional heavy rainfall to the central San Joaquin Valley. Snow levels were around 8000 feet on the 10th lowering to around 6500 feet in Yosemite Park on the afternoon of the 11th in a cooler and showery airmass.

View location on OpenStreetMap → (37.5702, -119.9364)

Source: NOAA Storm Events Database, event_id 682700. Narrative written by the NWS forecast office that issued the report.