Alertes en vigueurOxnard, CA

The National Weather Service in Los Angeles/Oxnard has issued a Flash Flood Warning for Southwestern Los Angeles County in southwestern California Southeastern Ventura County in southwestern California Until noon PST. At 703 AM PST, Doppler radar and automated rain gauges indicated heavy rain falling across the warned area. The expected rainfall rate is 0.5 to 1 inch in 1 hour. Additional rainfall amounts up to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly.
Hazard: Flash flooding caused by heavy rain.
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. 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.

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 603 AM PST, Doppler radar indicated heavy rain across the warned area. The expected rainfall rate is 0.5 to 1.25 inches in 1 hour. Significant flooding is already occurring.
Hazard: Flash flooding caused by thunderstorms.
Source: Law enforcement reports and 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. Rockslides and mudslides are possible or already occuring. Some locations that will experience flash flooding include Simi Valley, Ventura, Fillmore, Ojai, Chatsworth, Moorpark, Santa Paula, Rose Valley, Ventura Harbor, Topatopa Peak, Somis, El Rio, Meiners Oaks, Piru, Lake Piru, Reyes Peak, Lake Casitas and Solimar Beach.

Avoid flooded roads. Be aware of rock slides and mudslides.

What: Flooding caused by excessive rainfall is expected.
Where: A portion of southwest California, including the following counties, the western portion of Los Angeles and the northern Ventura County Mountains.
When: Until 400 PM PST Wednesday.
Impacts: Minor flooding in low-lying and poor drainage areas. Water over roadways.
Additional Details: - At 242 AM PST, Doppler radar and automated rain gauges indicated heavy rain. Minor flooding is ongoing or expected to begin shortly in the advisory area. Up to 1 inch of rain has fallen. - Some locations that will experience flooding include Thousand Oaks, Malibu, Chatsworth, Santa Clarita, Agoura Hills, Northridge, Woodland Hills, Van Nuys, Encino, Santa Monica, Porter Ranch, Westlake Village, Canoga Park, Granada Hills, Calabasas, Malibu Creek State Park, Sylmar, Lockwood Valley and Topanga State Park. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route.

At 726 AM PST, severe thunderstorms were located along a line extending from near Fillmore to near Thousand Oaks to Malibu, moving east at 25 mph.
Hazard: 60 mph wind gusts.
Source: Radar indicated.
Impact: Expect damage to roofs, siding, and trees. Locations impacted include Thousand Oak
S: Simi Valley North Hollywood Encino Woodland Hill
S: Malibu Agoura Hill
S: Van Nuy
S: Chatsworth Santa Clarita Beverly Hill
S: Northridge Santa Monica Hollywood Moorpark Sylmar Studio City Interstate 405 through the Sepulveda Pa
Ss: Pacific Palisade
S: and Porter Ranch.

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. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways.

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.