Sunday, February 15, 2026

Flood Watch Issued for Pasadena, Altadena as Heavy Rain Threatens Region on Monday

Image Courtesy @victorcab twitter

A Flood Watch covering most of Central and Southern Los Angeles County — including Pasadena and Altadena — will be in effect from Monday morning through Monday evening as a line of heavy showers and thunderstorms moves across the region, according to a National Weather Service alert issued Saturday afternoon.

The Weather Service’s Los Angeles/Oxnard office announced the watch at 12:20 p.m., warning that flooding caused by excessive rainfall is possible across most of Central and Southern Los Angeles County, all of Ventura County, and most of Central and Southern Ventura County, including several burn-scar areas. Both Pasadena and Altadena are among the many communities included in the advisory.

Forecasters said flash flooding is possible, with excessive runoff potentially affecting low-lying and flood-prone locations, creeks, streams, and urban areas with poor drainage. Low-water crossings may flood, and extensive street flooding is possible.

Rock and mud slides are also possible near steep terrain, and debris flows may occur on burn scars. The Weather Service noted that areas above roughly 6,000 to 6,500 feet are expected to receive snow instead of rain, reducing the flooding risk at higher elevations.

A line of heavy showers and thunderstorms is expected to sweep across the region Monday, followed by scattered heavy showers and thunderstorms into the evening, prolonging the risk of flooding in isolated areas.

Residents are urged to monitor later forecasts and remain alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. The advisory cautions that travel through passes and canyons could become dangerous and warns of potential rock and mud slides. The Weather Service advises following the direction of emergency management and law enforcement officials.