LOS ANGELES (CNS) — Light to moderate rain doused the Southland on Monday, and the storm also brought a phenomenon called “The Palmdale Mountain Wave,” which buffeted parts of the Antelope Valley.

The phenomenon caused sustained winds of more than 50 miles per hour accompanied by gusts of more than 70 mph, forecasters said. It began around 8 p.m. Sunday and was still blowing after 3 Monday — well beyond the “few hours’’ such an event usually lasts, National Weather Service meteorologist Curt Kaplan said.

The Palmdale Mountain Wave is caused when southwesterly air flowing over the San Gabriel Mountains is met by “an inversion on top that pushes the air down,’’ Kaplan said.

The result is sustained high winds and higher gusts, which were felt in Lake Palmdale, Lancaster, Palmdale, Poppy Park, Grass Mountain and Valyermo, he said. The event usually occurs before a storm front comes through, which was the case Monday, Kaplan said.

The sustained winds and high gusts have blown down five trees in Palmdale, Sgt. Philip Anderson of the Palmdale sheriff’s station said.

The station also has received an increased number of calls due to alarms set off by doors and windows rattling, he said.

Lancaster received 0.24 inches of rain overnight, according to the weather service, while Palmdale got 0.11 inches. All of the rain fell before 4 a.m.

Monday’s rain was the result of a second Pacific storm after a system that hit Sunday, Kaplan said, adding that a quarter of an inch of rain is expected in L.A. County this morning, three-quarters in Ventura County.

No mud or debris flows, or flash flooding of the type that struck Sunday, were expected as a result of Monday’s rains, he said.

The snow level in the San Gabriels was at 5,000 feet this morning, expected to rise to 7,000 feet later this morning.

The next storm — one of several lined up in the Northern Pacific and riding the jet stream to the Southland, according to Kaplan — is expected Wednesday but the lion’s share of the precipitation likely will remain north of L.A. County, he said. A storm much more likely to strike L.A. County is expected on Friday.

Another weather impact was being felt on Pacific Coast Highway near Malibu, where weekend rain caused debris flows that trapped cars and forced the closure of a section of road.

Caltrans officials said PCH would remain shut down in both directions from Las Posas Road in Ventura County to Encinal Canyon Road in Malibu until at least through later today, possibly through Tuesday.

Weather forecasts and warnings will not be interrupted by the ongoing federal government shutdown, NWS officials said, although forecasters were working without pay.

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