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Weather Alert: Widespread Ponding, Flooding Expected

A Southland rainstorm is expected to drop a half inch to an inch of rain on the region before moving east.

A heavy band of rain moved across Los Angeles County, and triggered warnings from the National Weather Service of possible localized ponding and flooding across the Southland.

Malibu and the Conejo and Santa Clarita valleys appeared to bear the brunt of the storm. Rockslides were reported on Mulholland Highway above Malibu, and some ramps and freeway lanes were flooding along the Antelope Valley (14) Freeway near Canyon Country.

An urban stream flooding advisory was issued for the San Gabriel Mountains in La Canada-Flintridge, Sunland-Tujunga and Lake View Terrace. But county flood experts said they did not expect mudflows from the Station Fire burned slopes.

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``Rainfall rates over Malibu were around one half inch per hour,'' the NWS office in Oxnard said. It predicted widespread ponding and intersection flooding as the band of rain moved east into Los Angeles. Steady rain may last for 3-5 hours, then taper off in the afternoon, according to the NWS.

Winds will be out of the southeast at 15-25 mph, and temperatures will top out around 60 degrees. Thunderstorms are possible after the low-pressure front passes, and the Los Angeles Basin should get a half-inch to an inch of rain by the time the storm moves east.

Find out what's happening in La Cañada Flintridgewith free, real-time updates from Patch.

``We've got a pretty narrow frontal band,'' said NWS Meteorologist Dave Bruno. ``It'll probably rain for 3-5 hours, stop, then start up again in the afternoon.''

The seasonal total dating from July 1 is 5.98 inches, about 45 percent of normal for this time of year, which is 13.29 inches, Bruno said. Los Angeles typically gets about 15 inches of rain per year, most of it December-March. The higher the elevation, the higher the rainfall amounts, Bruno said.

Some of the south-facing San Gabriel Mountain foothills could get up to 2 inches of rain. Eight to 15 inches of snow is expected at elevations of about 6,000 feet or more, and that should add a few days to Southern California's foreshortened skiing and snowboarding season due to a lack of snow. Some snow should fall at elevations as low as about 4,500 feet. Monday should be dry and mostly sunny, with highs in the upper 60s.

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