A cold upper level trough and Pacific front traversed the region on the 23rd and 24th of December. The heaviest precipitation fell from the evening of the 23rd through the morning of the 24th. Snowfall lingered through the 24th in the San Bernardino County Mountains. Snow was the main impact with snow levels as low as 3,500 ft, and accumulations of close to 2 ft on the highest peaks in the San Bernardino County Mountains. Rainfall totals ranged from 0.50 inches at the coast to 2.00 inches along the coastal slopes. Gusty winds also impacted the mountains and desert slopes.

Heavy Snow in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 23-DEC-16 20:00:00 to 24-DEC-16 18:00:00 (PST-8)
Reported by: Trained Spotter

Multiple spotters reported 12 hour snowfall totals of 18 inches in Big Bear between 2100PST on the 23rd and 0900PST on the 24th. Other 12 hour totals in the San Bernardino County Mountains included 18 inches near Green Valley Lake, 12 inches in Forest Falls, 11 inches in Wrightwood, and 10 inches in Lake Arrowhead.

Heavy Snow in RIVERSIDE COUNTY MOUNTAINS, CALIFORNIA
From 23-DEC-16 22:00:00 to 24-DEC-16 09:00:00 (PST-8)
Reported by: Trained Spotter

A spotter in Fern Valley reported an 11 hour snowfall total of 14 inches between 2200PST on the 23rd and 0900PST on the 24th. Another spotter reported 7 inches of snow in Idyllwild during this same period.

Winter Weather in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 23-DEC-16 22:00:00 to 24-DEC-16 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotters in Julian and at Mt. Laguna reported 10 hour snowfall totals of 6 inches between 2200PST on the 23rd and 0800PST on the 24th. During the same period 5 inches fell at Palomar Mountain, 2 inches in Guatay and 1 inch in Pine Valley.

High Wind in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 24-DEC-16 11:20:00 to 24-DEC-16 13:20:00 (PST-8)
Magnitude: 63.00 MG
Reported by: Mesonet

Winds at Volcan Mountain gusted in excess of 70 mph for 2 hours, with peak gust of 73 mph. Numerous other stations in the San Diego County Mountains gusted between 55 and 70 mph between 0800 and 1800PST on the 24th. No damage was reported.

Strong Wind in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 24-DEC-16 13:30:00 to 24-DEC-16 14:00:00 (PST-8)
Magnitude: 35.00 EG
Property damage: 2.00K
Reported by: Law Enforcement

CHP reported a tree down along Sweetwater Rd. in Lemon Grove. Peak gusts in the area were near 40 mph, with most gusts in the 25-35 mph range. This was the only significant damage report along the coast.

Strong Wind in ORANGE COUNTY COASTAL, CALIFORNIA
From 24-DEC-16 04:00:00 to 24-DEC-16 05:00:00 (PST-8)
Magnitude: 35.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Several trees were downed near Orange Coast College in Costa Mesa. Winds in the area were predominantly gusting 25-35 mph with isolated gusts to 40 mph.

Strong Wind in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 23-DEC-16 21:30:00 to 23-DEC-16 23:30:00 (PST-8)
Magnitude: 35.00 EG
Property damage: 3.00K
Reported by: Trained Spotter

A large tree downed by winds blocked the road near the intersection of Rancho Bernardo Rd. and Alva Rd. Peak gusts in the area were near 40 mph, with most gusts in the 25-35 mph range. This was the only significant damage report in the valleys.

High Wind in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 24-DEC-16 20:51:00 to 24-DEC-16 22:51:00 (PST-8)
Magnitude: 70.00 MG
Reported by: Mesonet

The RAWS station in Burns Canyon measured wind gusts in excess of 70 mph for 2 hours, with a peak of 80 mph during a surfacing mountain wave. Other stations in the area measured gusts between 35 mph and 50 mph during the same period.