Update 3:00 p.m. Monday:
Santa Ana winds are headed toward SoCal on Monday, bringing the possibility of 55 mph gusts and summer-like temperatures just two days before Christmas, reports AP.
"We're going into a Santa Ana event, and those start with north winds the day before," National Weather Service meteorologist Bill Forwood told AP.
The Santa Ana winds were expected to arrive late Monday and last into Tuesday morning, with gusts as high as 55 mph in mountain passes and parts of the San Fernando and Santa Clarita valleys.
The Santa Ana winds were expected to push temperatures well above the average high of 68 degrees for this time of year. The temperature was expected to hit 80 degrees Tuesday in downtown Los Angeles.
A cooling trend could begin Wednesday as the winds dissipate, Forwood said. Dry weather was expected to continue through the holiday weekend.
An unexpected blast of northerly winds across parts of Southern California has eased after toppling some trees and causing localized power outages, the Associated Press reports.
The National Weather Service says a phenomenon called a standing mountain wave occurred Sunday night, allowing high-speed winds from the mid-levels of the atmosphere to reach the surface, according to AP.
Some mountain ridgetop sensors reported gusts from 80 mph to 90 mph before the wave dissipated around 2 a.m. Monday, AP reports.
On Sunday night, in Chatsworth, a 40-foot-tree fell on a Toyota Prius when a strong wind swept across a neighborhood, NBC4 reports.
About 1,100 Department of Water and Power customers were left without power, and the weather service warned that powerful gusts could cause more downed trees and power outages, according to NBC4.
High-wind warnings have been replaced by advisories for winds between 20 mph and 35 mph, with gusts up to about 50 mph, AP reports.
The offshore flow is expected to bring sunny weather with above-normal temperatures, and building high pressure in the Great Basin will bring Santa Ana winds to Southern California on Tuesday, with highs in the mid-70s to low 80s, AP reports.