Heavy rain forces flood advisory in Los Angeles Basin and valleys

Heavy rain swept into the Los Angeles area before dawn Saturday morning, causing the National Weather Service to issue a flood advisory for the L.A. Basin and the San Fernando and San Gabriel valleys. The National Weather Service said treacherous driving conditions caused hydroplaning on the 405 Freeway Saturday morning, and that urban flooding was expected through L.A. County through to 6:30 a.m. Flooding was also reported on the 110 and 91 freeways. Forecasters warned of “nuisance debris flows” in the burn areas.

Rain was falling as fast as one-tenth to one-quarter of an inch an hour in some areas, forecasters said.

The flood advisory, effective until 6:30 a.m., covered much of the region, from Sunland-Tujunga and Lake View Terrace to La Crescenta, La Canada Flintridge, Monterey Park, Sierra Madre, Diamond Bar, Acton, Long Beach and downtown Los Angeles. A flood advisory means that residents can expect ponding of water in urban areas.

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