Active AlertsManhattan Beach at El Porto, CA

What: Flooding caused by excessive rainfall is possible.
Where: A portion of southwest California, including the following areas, Calabasas and Agoura Hills, Central Ventura County Valleys, 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, Malibu Coast, Northern Ventura County Mountains, Ojai Valley, Palos Verdes Hills, Santa Barbara County Interior Mountains, Santa Barbara County Southeastern Coast, Santa Barbara County Southwestern Coast, Santa Clarita Valley, Santa Susana Mountains, Santa Ynez Mountains Eastern Range, Santa Ynez Mountains Western Range, Southeastern Ventura County Valleys, 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: From Wednesday evening through Thursday evening.
Impacts: Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Debris flow are possible near recent burn scars. There is a high risk of rock and mudslides in the canyons.
Additional Details: - A strong winter storm will bring moderate to heavy rainfall to the area Wednesday night and Thursday. Given the antecedent conditions from last week's rain, the forecast rainfall totals and intensities could generate some significant hydrologic impacts. - 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.