The National Weather Service in San Diego has issued a High Wind Watch for San Diego County Mountains and Valleys until December 30th, 1pm.

Damaging winds may blow down trees and power lines.
Widespread power outages are possible.
Strongest winds will be in the early morning and afternoons.
Travel will be difficult, especially in high profile vehicles. Use caution if you drive.
This storm may intensify, monitor local radio and television stations for additional information and other possible warnings from the National Weather Service.
More forecast information, locations that will experience high winds, and updates are available from the San Diego National Weather Service and @NWSSanDiego