Flood Watch issued December 24 at 12:20AM PST until December 26 at 4:00PM PST by NWS Los Angeles/Oxnard CA
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
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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.