LOS ANGELES (AP) — On Friday, Southern California found itself grappling with relentless downpours, ushering in new flash flood warnings as the region continued to endure a spell of heavy rain that has pushed November’s precipitation levels near historic highs, according to the National Weather Service.

As the night gave way to dawn, residents of Los Angeles and Orange counties were alerted to the dangers of flash floods, with concerns about streets, creeks, and streams overflowing, alongside the risk of mudslides. In the coastal city of Huntington Beach, rainwater transformed some streets into temporary streams.

The National Weather Service issued the latest flash flood warnings covering a wide area, from the bustling heart of downtown Los Angeles and the scenic vistas of Santa Monica to the suburban enclaves of Mission Viejo in Orange County. In the early hours of Friday, reports surfaced of vehicles becoming stranded in rising waters near Culver City.

By the morning in Huntington Beach, much of the floodwater had subsided, though one neighborhood remained submerged after a local pond overflowed, inundating streets and encasing parked cars in water.

This deluge follows a sequence of storms that began on November 13, drenching the area with more than four times the typical rainfall for this time of year in downtown Los Angeles, as detailed by weather service records.

In a normal November, downtown Los Angeles typically gets 0.78 of an inch (2 centimeters) of rain, but has already seen about 3.5 inches (8.9 centimeters) this month.

Santa Barbara County has been a magnet for the moisture. Parts of the Santa Ynez Mountains have seen more than 15 inches (38 centimeters) of rain this month, the weather service said.

A potent atmospheric river is blamed for causing at least a half-dozen deaths earlier this month as it rolled across much of California. Heavy rains also bring the threat of mudslides in areas that were recently ravaged by wildfire.

Atmospheric rivers are long and relatively narrow bands of water vapor that form over an ocean and flow through the sky, transporting much of the moisture from the tropics to northern latitudes.