A flash flood warning was extended for parts of Los Angeles County on Tuesday as a powerful storm system brought heavy rainfall and hazardous conditions to Southern California, according to reports from NBC Los Angeles.
The storm, the first of three expected to impact the region in the coming days, intensified Monday evening, with forecasts predicting between one and three inches of rain in coastal and valley areas, and two to five inches in the mountains. Preliminary precipitation amounts recorded over a 12-hour period show significant variation across the county. Downtown Los Angeles received 1.85 inches of rain, although Avalon recorded 1.55 inches. Inland areas saw less rainfall, with Claremont reporting only 0.22 inches.
The National Weather Service reported that Los Angeles Airport (LAX) received 0.76 inches of precipitation in the past 24 hours, while Hawthorne recorded 0.41 inches. Further inland, Van Nuys received 0.26 inches. The storm system prompted widespread Flood Watches across Los Angeles, Ventura, and San Bernardino counties.
San Antonio Dam has already recorded over 15 inches of cumulative precipitation as of Monday, according to FOX 11 Los Angeles. The current season’s rainfall-to-date for Downtown Los Angeles, measured at the Frank Hotchkin Memorial Training Center in Elysian Park, is not currently available, but the Los Angeles Almanac website indicates that this location is typically used when weather reports cite Los Angeles without specifying a particular area.
The National Weather Service’s regional temperature and precipitation table, updated as of 4:08 PM PST on Tuesday, February 17, 2026, shows varying temperatures and precipitation levels across the region. For example, Mount Wilson recorded 0.34 inches of precipitation, while Lancaster reported 0.02 inches. Many locations reported trace amounts of precipitation.
The storm system is expected to bring hazardous travel conditions and the threat of flash flooding. The National Weather Service has not issued a statement regarding the expected duration of the flash flood warning.
