A cold trough of low pressure dropped down the West Coast, before closing off over southern California. This system brought light to locally moderate showers to most areas, except the Coachella Valley, on the afternoon and evening of the 6th. Light showers lingered into the morning of the 7th near the mountains. Rainfall totals for the coast and valleys were mostly light, generally ranging from one-tenth to one-third of an inch, with three-quarters of an inch to an inch for the lower mountains and foothills. The lower deserts generally received less than one-tenth of an inch, with the exception of Borrego Springs with 0.16 inches of rain. The snow level fell to between 3500 and 4000 feet, with 1 to 3 inches of snow below 6000 feet, and up to 6 inches above 6000 feet.On the 10th, a very cold trough of low pressure from the northwest moved through southern California, bringing significant cooling, low snow levels, gusty west winds and light to locally moderate precipitation along and west of the mountains. The snow level dropped to around 2500 feet, with accumulating snow of around one-half inch down to around 3000 feet in locations such as Hesperia and the Cajon Pass in San Bernardino County, and Julian in San Diego County. Up to 5 inches of snow fell above 4000 feet. Chains were required in most mountain areas as well. Gusty winds also accompanied the storm on the 10th, even resulting in some blowing dust in the Coachella Valley. Strong winds across the coastal waters, combined with a large swell and astronomical high tides, resulted in minor coastal flooding during the morning of the 11th in La Jolla, Imperial Beach and Newport Beach. Most flooding was limited to a few beach parking lots and some nearby surface streets.

High Wind in COACHELLA VALLEY, CALIFORNIA
From 10-JAN-13 13:00:00 to 10-JAN-13 16:00:00 (PST-8)
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Sky Valley mesonet station recorded a peak gust of 76 mph around 1542 PST. During this afternoon, the  Thermal Airport ASOS measured a peak gust of 49 mph between 1251 and 1351 PST, with one-quarter mile visibility due to blowing dust.

High Wind in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 10-JAN-13 08:00:00 to 10-JAN-13 16:00:00 (PST-8)
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High winds began at the Volcan Mountain SDGE mesonet between 0800 and 0810 PST on the 10th and ended between 1550 and 1600 PST the same day. During this time, winds gusted above 60 mph almost the entire time. This included a few gusts above 70 mph and the peak gust of 73 mph, which was measured between 1300 and 1310 PST.
High winds also occurred at the Harrison Park mesonet, between 1030 and 1430 PST on the 10th. During this time, sustained winds were around 45 mph with gusts over 60 mph. This included the peak gust of 63 mph, which was measured between 1340 and 1350 PST.

Coastal Flood in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 11-JAN-13 07:00:00 to 11-JAN-13 09:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

NBC 7 reported waves flooding streets over Camino del Oro and Avenida de la Playa in La Jolla around 0730 PST, during the time of high tide. High tide that morning was just under 7 and a half feet.