Debris Flow — P Sw San Bernardino, California

2003-09-04 · P Sw San Bernardino, California

Wider weather episode

Heavy rains over the previous three days helped saturate the soil. A thunderstorm moving along the ridge top dropped another 0.60 inches of rain that triggered a landslide. Observers stated it took about 20 minutes for the landslide to make it from the top of the mountain to the valley floor. About 300 feet of road were covered with four feet of mud and large boulders. Heavy downpours in Big Bear City also caused localized flooding.

Source: NOAA Storm Events Database, event_id 5337807. Narrative written by the NWS forecast office that issued the report.