Another storm system marching toward Southern California will bring rain, snowmelt, flooding

After an already exceptionally wet winter, Southern California is set to see yet another heavy storm move through the region, the National Weather Service said Monday.

Starting on Tuesday, March 14, a warm atmospheric river system will arrive, bringing up to 5 inches of rainfall to some valley regions and up to 8 inches in mountain communities, which could cause flooding in areas still recovering from storms in January and February.

Another storm is expected to come through 3/14 – 3/15 with expected up to 4″ & . We continue to make the necessary resources (sand, bags, and firewood) to our mountain residents. Free & bring a shovel for sand! Sandbag info, visit County Fire at

— SBCounty (@SBCounty) March 13, 2023

“This winter, we’ve gotten into this pattern where we’ve got a continuous stream of super moist storms coming into California, which has given us a lot of rain,” said National Weather Service meteorologist Stephanie Sullivan.

Rain will likely begin in the evening on Tuesday, continuing into Wednesday morning. Rain could fall at a rate of one inch per hour in some areas of Ventura and Los Angeles counties, with isolated thunderstorms also possible. A flood watch is in effect for most of Southern California through Wednesday. Snowfall is predicted above 7,000-8,000 feet in elevation, but below that, precipitation will fall mainly as rain.

People enjoy the outdoors at Pierpoint Landing in Long Beach on Monday, March 13, 2023. (Photo by Brittany Murray, Press-Telegram/SCNG)

Antonio Romero exercises his 11-month old Belgian Malinois, Mecho, at Kenyon Park in Rancho Cucamonga on Monday, Mar. 13, 2023. Romero said he wanted to take advantage of the good weather Monday because his pup gets anxious after being in the house too long without exercise. (Photo by Will Lester, Inland Valley Daily Bulletin/SCNG)

A couple take advantage of the sunny afternoon by taking a walk around North Lake in Irvine on Monday, March 13, 2023. Another rainstorm is expected to it Southern California on Tuesday. (Photo by Leonard Ortiz, Orange County Register/SCNG)




Coastal Santa Barbara  could receive up to 5 inches of rain. The Los Angeles Basin can generally expect about 2 1/2 inches. The San Fernando Valley is expected to receive around 2 to 3 inches of rain. Long Beach will likely see just over 2 inches.  Southern Santa Barbara County and extreme western Ventura County mountains could get receive 4 to 8 inches of snow, the NWS said.

Coastal Orange County could see 2 inches while Riverside could get three quarters of an inch to 1 inch on Tuesday and another quarter to half an inch on Wednesday. The San Bernardino County Mountains may see 3 to 5 inches of rain.

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The rain could mean trouble for mountain communities, where some residents are still digging their homes out of deep snow even as the main thoroughfares  in and out of the mountains reopened over the weekend.

San Bernardino County officials said on Monday that they were working to prepare for  the storm.

“We’re already working to inform the community to inform them about the risks,” said San Bernardino County representative David Wert. “Public Works crews are examining all of the flood control facilities to make sure they’re clear of debris and snow, and they’re watching the forecast.”

The San Bernardino County Fire Department announced there will be additional staffing ahead of the storm.

By late Wednesday, the storm will have mostly passed, with clear skies and drier weather for a few days. The NWS, however, has noted that another storm system could form next week.


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