A series of low pressure systems from the north and northwest, plus a weak tap into atmospheric river moisture, brought rain, mountain snow, and gusty winds to Southern California. Snow levels reached as low as 2000 feet, and brought high impact snow to locations above 4000 feet. Both I-8 through the San Diego Mountains and I-15 through the Cajon Pass were closed due to heavy snowfall. Between December 22-24, the coastal areas received 1-1.5 inches of rainfall, the valleys received 0.50-1 inch, and the mountain areas received up to 1 inch of rainfall. Again on December 26 through 27, coast and valley areas received 1 to 1.5 inches. Mountain areas received up to an inch. There were many water rescues, particularly in the Tijuana River Valley due to individuals driving through flooded roads and getting stuck. The San Diego River at Fashion Valley reached 10.5 feet on December 26.

Heavy Rain in SAN DIEGO, CALIFORNIA
From 26-DEC-19 00:00:00 to 27-DEC-19 23:59:00 (PST-8)
Location: PONTO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

San Diego County coastal areas and valley areas received 1 to 1.5 inches between December 26 and 27. The mountain areas received up to 1 inch. There were many reports of water rescues, especially along the coast. The San Diego River at Fashion Valley reached 10.5 feet on December 26th.

Flood in SAN DIEGO, CALIFORNIA
From 26-DEC-19 07:00:00 to 26-DEC-19 12:00:00 (PST-8)
Location: SAN MARCOS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Flooding in San Marcos due to heavy rain.

Flood in SAN DIEGO, CALIFORNIA
From 26-DEC-19 07:00:00 to 26-DEC-19 12:00:00 (PST-8)
Location: (NRS)NAF IMPERIAL BE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A delivery driver was stranded in flood waters near the Mexico border, requiring rescue by a horse.

Heavy Rain in SAN DIEGO, CALIFORNIA
From 22-DEC-19 00:00:00 to 24-DEC-19 23:59:00 (PST-8)
Location: (CRQ)PALOMAR ARPT CA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Many locations across coastal San Diego County reported 1 to 1.5 inches of precipitation (2-day storm total) from December 22 through 24.

Heavy Snow in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 22-DEC-19 00:00:00 to 24-DEC-19 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Total snow from December 22 through 24 in the San Bernardino Mountains: Angelus Oaks 6 inches, Mountain Pass 1 foot, Arrowhead 25 inches, Big Bear City 3 feet, Wrightwood 8 inches, Top of Cajon Pass 2 inches.

Winter Weather in APPLE AND LUCERNE VALLEYS, CALIFORNIA
From 26-DEC-19 00:00:00 to 27-DEC-19 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Phelan received 13 inches of snow. Victorville, Apple Valley and Hesperia received 2 to 4 inches of snow.

Heavy Snow in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 26-DEC-19 00:00:00 to 26-DEC-19 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Total snow accumulation on December 26 in the San Bernardino Mountains: Mountain High 30-36 inches, Wrightwood 22-26 inches, Mt. Baldy (base of mountain) 28 inches, Big Bear Snow Summit 18-26 inches, Snow Valley 18-22 inches, Lake Arrowhead 16 inches. I-15 through the Cajon Pass was closed on December 26th due to heavy snow.

Winter Weather in RIVERSIDE COUNTY MOUNTAINS, CALIFORNIA
From 22-DEC-19 00:00:00 to 24-DEC-19 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Idyllwild received 3 inches of snow between December 22 and 24.

Heavy Snow in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 26-DEC-19 00:00:00 to 27-DEC-19 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Total snow accumulation December 26 and 27 in the San Diego County mountains: Mount Laguna 12 inches and Palomar Mtn (Birch Hill) 10 inches. Interstate 8 was closed on December 26th due to heavy snowfall.

Strong Wind in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 26-DEC-19 04:00:00 to 26-DEC-19 07:00:00 (PST-8)
Magnitude: 39.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Many downed trees in National City due to strong winds and a tree fell on top of a vehicle. Winds nearby were around 45 mph.