This weekend is already a wet one in Southern California, with the region bearing the brunt of a storm set to dump a considerable amount of rainfall and potentially lead to flooding, mudslides and traffic impacts.

Forecasters and Doppler radar projections indicate that up to half-an-inch of rain could fall in just 30 minutes in some spots during the course of the storm. Officials with the National Weather Service (NWS) advised that Saturday will likely be the day with the most intense rainfall for most of SoCal.

In the NWS area forecast discussion on Friday night, weather experts noted that the system bringing widespread precipitation is “unusually strong.”

“There is a growing risk for significant impacts Saturday, including dangerous flooding, damaging debris flows and major road closures,” NWS officials said. “Heavier rain [was] expected Friday night into Saturday as the main low moves over the area…Rain will likely be heavy at times, and for areas that see the heaviest rain, they could also see significant roadway flooding, road closures, rock and mudslides on canyon roads, and debris flows and flash flooding in and near recent burn scars.”

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A Flash Flood Warning is in effect for southwestern Los Angeles County due to the storm, which forecasters say could produce lightning at times. As of 6 a.m. Saturday, flash flooding was “already occurring” in the area, according to the NWS alert. The warning is tentatively set to expire at noon Saturday.

Other parts of the region are under a Flood Advisory Saturday morning; the advisory is set to expire at 8:15 a.m. Saturday.

According to NWS, impacts from the storm will likely include travel delays, blown objects on roadways, rockslides and mudslides on canyon roads, potentially significant roadway flooding, increased flow in creeks and streams and — arguably most critically — potentially damaging debris flows and flooding in and around recent burn scars.

Southern California residents are advised to limit travel during the storm if possible and to follow instructions from local law enforcement officials, as the rain is set to linger for most of the day Saturday.

“Heavy rain to come [Saturday]…we have hours of this expected,” said KTLA meteorologist Kacey Montoya. “Some of us will get a nice break Saturday afternoon, but if you think you’re done, no…more heavy rain [will come].”

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