Active AlertsPacific Palisades, CA

At 839 AM PST, Doppler radar and automated rain gauges indicated that heavy rain was falling across the warned area. The expected rainfall rate is 0.5 to 1.25 inches in 1 hour. Flash flooding is already occurring.
Hazard: Life threatening flash flooding. Heavy rain producing flash flooding. Rock slides and mud slides.
Source: Radar and automated gauges.
Impact: Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. Some locations that will experience flash flooding include Acton, Burbank, Mount Wilson, Pasadena, North Hollywood, Santa Clarita, Northridge, Chatsworth, Altadena, La Canada Flintridge, Sunland, Glendale, Pacoima, Sylmar, Granada Hills, Porter Ranch, La Crescenta, Sun Valley, Angeles Crest Highway between Mount Wilson and Mount Waterman and San Fernando.

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

The National Weather Service in Los Angeles/Oxnard has issued a Flash Flood Warning for Southern Los Angeles County in southwestern California Until noon PST. At 953 AM PST, Doppler radar indicated heavy rain across the warned area. Flash flooding is ongoing or expected to begin shortly. Rock slides and mud slides are expected.
Hazard: Flash flooding caused by heavy rain. Rock slides and mud slides.
Source: Radar.
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 Long Beach, Downtown Los Angeles, Inglewood, Alhambra, Torrance, Culver City, Hollywood, Griffith Park, Hermosa Beach, Manhattan Beach, Whittier, Redondo Beach, Beverly Hills, Pasadena, Venice, Rancho Palos Verdes, Santa Monica and West Covina.

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

The National Weather Service in OXNARD has issued a Severe Thunderstorm Warning for Southeastern Los Angeles County in southwestern California Until 1045 AM PST. At 1015 AM PST, a severe thunderstorm was located over Alhambra, moving northeast at 25 mph.
Hazard: 60 mph wind gusts.
Source: Radar indicated.
Impact: Expect damage to roofs, siding, and trees. Locations impacted include Alhambra Pasadena Altadena Eagle Rock La Canada Flintridge Glendale Commerce Montebello Boyle Height
S: El Monte Monterey Park Highland Park San Gabriel Elysian Park Arcadia Sierra Madre Baldwin Park Echo Park Monrovia and Atwater Village.

Remain alert for a possible tornado! Tornadoes can develop quickly from severe thunderstorms. If you spot a tornado go at once into the basement or small central room in a sturdy structure. For your protection move to an interior room on the lowest floor of a building.

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.