Active AlertsVenice Beach at Rose Ave, CA

The National Weather Service in Los Angeles/Oxnard has issued a Flash Flood Warning for Northern Los Angeles County in southwestern California Until noon PST. At 1053 AM PST, Doppler radar indicated moderate rain across the warned area. Flash flooding is ongoing or expected to begin shortly, as heavy rain over the mountains causes downstream flash flooding through creeks and streams across the Antelope Valley.
Hazard: Flash flooding caused by heavy rain.
Source: Trained spotters reported.
Impact: Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. Some locations that will experience flash flooding include Lake Los Angeles, Acton, Palmdale, Lancaster, Santa Clarita, Quartz Hill, Pearblossom, Llano, Littlerock, Lake Palmdale, Elizabeth Lake, Lake Hughes, Valyermo, Desert View Highlands, Saddleback Butte State Park, Highway 138 between Llano and the San Bernardino County line and Highway 138 between Quail Lake and Lancaster.

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.

What: Significant and widespread flooding caused by excessive rainfall will be likely, with potential debris flow impacts across recent burn scars.
Where: A portion of southwest California, including the following areas, Antelope Valley, Calabasas and Agoura Hills, Catalina and Santa Barbara Islands, Central Ventura County Valleys, Cuyama Valley, Eastern Antelope Valley Foothills, Eastern San Fernando Valley, Eastern San Gabriel Mountains, Eastern Santa Monica Mountains Recreational Area, Interstate 5 Corridor, Lake Casitas, Los Angeles County Beaches, Los Angeles County Inland Coast including Downtown Los Angeles, Los Angeles County San Gabriel Valley, Northern Ventura County Mountains, Ojai Valley, Palos Verdes Hills, San Luis Obispo County Beaches, San Luis Obispo County Inland Central Coast, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Barbara County Central Coast Beaches, Santa Barbara County Inland Central Coast, Santa Barbara County Interior Mountains, Santa Barbara County Southeastern Coast, Santa Barbara County Southwestern Coast, Santa Clarita Valley, Santa Lucia Mountains, Santa Susana Mountains, Santa Ynez Mountains Eastern Range, Santa Ynez Mountains Western Range, Santa Ynez Valley, Southeastern Ventura County Valleys, Southern Salinas Valley, Southern Ventura County Mountains, Ventura County Beaches, Ventura County Inland Coast, Western Antelope Valley Foothills, Western San Fernando Valley, Western San Gabriel Mountains and Highway 14 Corridor and Western Santa Monica Mountains Recreational Area.
When: Through Friday afternoon.
Impacts: This prolonged strong Atmospheric River storm system will bring periods of heavy rain from late Tuesday into Thursday evening. Potential flooding impacts include the threat of significant and widespread urban roadway flooding, a high risk of major rock/mudslides, and rapid rises in creeks, streams, and rivers which will likely lead to swift water rescues. The recent burn scars will be at risk for debris flows, possibly damaging. These flooding impacts will likely lead to significant travel delays and road closures during this busy holiday travel period.
Additional Details: - Heavy rainfall with possible thunderstorms is expected with high rainfall rates, potentially exceeding one inch per hour during the peak of the event Tuesday night into Wednesday across favored south facing slopes and near thunderstorms. Another round of heavier rain and thunderstorms will be possible on Thursday. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

At 937 AM PST, Doppler radar and automated rain gauges indicated that moderate to heavy rain was continuing to fall. The Conejo Creek at Ridge View has rapidly risen above flood stage and has reached minor flood stage. There is the possibility for the river to continue rising, and a crest at moderate stage cannot be ruled out. Flash flooding is already occurring.
Hazard: Flash flooding caused by heavy rain. Rock slides and mud slides.
Source: Radar and automated gauges.
Impact: Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. Rock slides and mud slides. Some locations that will experience flash flooding include Thousand Oaks, Simi Valley, Camarillo, Malibu, Woodland Hills, Agoura Hills, Chatsworth, Northridge, Encino, Van Nuys, Santa Monica, Beverly Hills, North Hollywood, Universal City, Hollywood, Burbank, Griffith Park, Pasadena and Alhambra.

Avoid flooded roads. Be aware of rock slides, mudslides, and possibly debris flows.

What: Flooding caused by excessive rainfall is expected.
Where: A portion of southwest California, including the following county, Los Angeles. Specifically, the San Gabriel Valley.
When: Until noon PST.
Impacts: Minor flooding in low-lying and poor drainage areas. Water over roadways. Rockslides and mudslides are possible.
Additional Details: - At 730 AM PST, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. - Some locations that will experience flooding include West Covina, Glendora, San Dimas, Alhambra, Pomona, Pasadena, Downtown Los Angeles, Altadena, La Verne, Hancock Park, Baldwin Park, Azusa, Covina, Monrovia, El Monte, Arcadia, Sierra Madre, San Gabriel, Diamond Bar and Montebello. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. In addition, Be aware of rock slides and mudslides near hilly and or mountainous terrain.

What: Large breaking waves of 6 to 10 feet with dangerous rip currents.
Where: Ventura County Beaches, Malibu Coast and Los Angeles County Beaches.
When: Until 11 AM PST Saturday.
Impacts: There is an increased risk for ocean drowning. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore.
Additional Details: Minor to potentially isolated moderate coastal flooding for south-facing beaches especially during high tides. This is expected to occur through Thursday due to strong southerly winds.

Remain out of the water due to dangerous surf conditions, or stay near occupied lifeguard towers. Rock jetties can be deadly in such conditions, stay off the rocks.