Surface high pressure peaked at 1045 mb over western Utah(similar in strength to December 9-10 event, which was centered in eastern Nevada) and appeared to be diurnally enhanced due to strong radiational cooling in the Utah desert. This setup resulted in moderate to locally strong Santa Ana winds. The winds developed in the mountains and spread into the inland valleys and coastal areas of Orange county on the 14th, with strengthening winds in San Diego County late in the day. A secondary peak of offshore winds occurred the night of the 14th through midday on the 15th with the strongest winds across the Riverside and San Diego County mountains and foothills. The highest wind gusts were observed in the mountains and foothills of San Diego County.

High Wind in SANTA ANA MOUNTAINS AND FOOTHILLS, CALIFORNIA
From 14-DEC-13 02:30:00 to 14-DEC-13 11:30:00 (PST-8)
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High winds began at the Pleasants Peak mesonet between 0230-0300 PST and ended between 1100-1130 PST on the 14th. During this time, winds were sustained 40-50 mph out of the east-northeast, gusting mostly above 60 mph. The peak gust of 72 mph was measured between 0500-0530 PST.

High Wind in COACHELLA VALLEY, CALIFORNIA
From 14-DEC-13 05:30:00 to 14-DEC-13 06:30:00 (PST-8)
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High winds occurred at the Sky Valley mesonet between 0557-0612 PST on the 14th. During this time, a peak gust of 72 mph was recorded, along with 2 other gusts of 62 mph.

High Wind in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 15-DEC-13 21:45:00 to 15-DEC-13 22:30:00 (PST-8)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High winds occurred at the Big Black Mountain mesonet between 2145-2215 PST on the 14th with a peak gust of 63 mph recorded during that period.

High Wind in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 14-DEC-13 20:00:00 to 15-DEC-13 08:00:00 (PST-8)
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High winds began at the Sill Hill mesonet between 1840-1850 PST on the 14th and ended between 1020-1030 PST on the 15th. During this time, sustained winds were 40-50 mph out of the east with most gusts over 65 mph. The peak gust of 81 mph was measured between 0140-0150 PST on the 15th.
High winds occurred at the Buckman Springs mesonet between 2230-2240 PST on the 14th with a peak gust of 67 mph recorded during that period.
High winds occurred at the Boulder Creek mesonet between 2000-2030 PST on the 14th with a peak gust of 61 mph recorded during that period.
High winds occurred at the Lucky Five Ranch mesonet between 2300-2330 PST on the 14th with a peak gust of 60 mph recorded during that period.
High winds occurred at the West Santa Ysabel mesonet between 0610-0750 PST on the 15th with a peak gust of 59 mph recorded during that period.
High winds occurred at the Crestwood mesonet between 0000-0100 PST on the 15th with a peak gust of 58 mph recorded during that period.
High winds occurred at the La Posta mesonet between 0040-0100 PST on the 15th with a peak gust of 58 mph recorded during that period.