A very cold trough of low pressure from the northwest moved through southern California on the 7th through the 10th, bringing significant cooling, low snow levels, gusty west winds and light to locally moderate precipitation along and west of the mountains. A few embedded thunderstorms were also observed on the 8th, producing periods of pea-sized hail and graupel. Hail accumulation was blamed for multiple accidents, closing portion of Interstate 15 near El Cajon. 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 dropped to 1500-2000 feet, with accumulating snow of 1-3 inches down to around 2600 feet in locations such as Beaumont and Yucaipa in the Inland Empire and Banning Pass. Significant snow fell above 5000 feet, with many locations receiving 6-12 inches. Some higher locations in the San Bernardino County mountains, such as Big Bear and Onyx Summit received up to 22 inches. During this storm, a major manhunt was underway for an ex-LAPD officer who was on the run after a killing spree. All major national news outlets were covering the search. A weak trough moved southward, early on the 10th, and interacted with residual low level moisture to produce a few light showers, mainly in the mountains and inland valleys of San Diego County. These showers only amounted to a tenth of an inch or less.

Dense Fog in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 07-FEB-13 02:00:00 to 07-FEB-13 09:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

March Air Base in Riverside reported visibility of one-quarter mile or less from 0222 to 0957 PST on the 7th. The lowest visibility reached was one-sixteenth of a mile and occurred from 0658 to 0957 PST.
Riverside ASOS reported visibility of one-quarter mile from 0701 to 0837 PST in dense fog on the 7th. Ontario ASOS also reported one-quarter mile visibility for 15 minutes from 0732 to 0747 PST.

High Wind in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 07-FEB-13 23:00:00 to 08-FEB-13 03:00:00 (PST-8)
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High winds began at the Mt. Laguna North mesonet station between 2300 PST on the 7th and 0000 PST on the 8th and ended between 0100 and 0200 PST on the 8th. During this time, winds gusted to 68 mph between 2303 and 0102 PST on the 8th.
High sustained winds of 40 to 43 mph occurred at the Volcan Mountain mesonet station between 2310 and 0100 PST on the 7th-8th. A peak gust of 59 was measured between 2330 and 2340 PST.

High Wind in APPLE AND LUCERNE VALLEYS, CALIFORNIA
From 08-FEB-13 05:00:00 to 08-FEB-13 09:00:00 (PST-8)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

High winds occurred at the Burns Canyon RAWS between 0500 and 0900 PST on the 8th. During this time, sustained winds of 40 mph were recorded at 0451 PST and a peak gust of 59 mph between 0651 and 0751 PST.

Strong Wind in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 08-FEB-13 10:00:00 to 08-FEB-13 11:00:00 (PST-8)
Magnitude: 30.00 EG
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Strong winds, along with pea-sized hail damaged a biomedical firm's roof in Sorrento Valley. A 20 by 30 foot section of skylight paneling was torn off from the company's rooftop.

High Wind in COACHELLA VALLEY, CALIFORNIA
From 08-FEB-13 03:00:00 to 08-FEB-13 15:00:00 (PST-8)
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Sky Valley Mesonet station recorded a peak gust of 71 mph around 1400 PST on the 8th. Occasional wind gusts of 58 mph or higher were recorded between 0300 and 1500 PST that day.

Heavy Snow in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 08-FEB-13 00:00:00 to 09-FEB-13 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two-day snowfall totals: 21 inches at Green Valley Lake, 20 inches at Onyx Peak, 18 inches at Snow Summit, 11 inches at Running Springs and 9-10 inches at Wrightwood and Lake Arrowhead. During this storm, a major manhunt was underway for an ex-LAPD officer who was on the run after a killing spree. All major national news outlets were covering the search.

Heavy Snow in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 08-FEB-13 00:00:00 to 09-FEB-13 05:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two-Day snowfall totals: 10 inches at Mt. Laguna, 6-8 inches at Cuyamaca, 8 inches at Palomar, 6 inches at Julian and 5 inches at Ranchita.

Hail in SAN DIEGO, CALIFORNIA
From 08-FEB-13 18:30:00 to 08-FEB-13 20:30:00 (PST-8)
Location: SAN DIEGO
Magnitude: 0.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Accumulations of pea-sized hail resulted in multiple traffic collisions along Interstate 15 between University and El Cajon Blvd. Southbound Interstate 15 was closed for a few hours.