Cold Pacific Storm System Produces Urban Flooding and Heavy Mountain Snow.

Heavy Snow in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 11-DEC-22 18:00:00 to 12-DEC-22 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

High-elevation snow impacted the San Diego County Mountains from the evening on December 11 through December 12. Snowfall of 1 to 5 inches was common, with a report of 8 inches reported at the Mt Laguna COOP. The Department of Highways implemented a chain control on SR-78 and SR-79 from Santa Ysabel to Pine Valley, with a snow level of 3500 feet.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 11-DEC-22 07:00:00 to 11-DEC-22 08:00:00 (PST-8)
Location: RANCHO CUCAMONGA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Swiftwater rescue of woman in Cucamonga Wash at Airport Drive. The Ontario Fire Department reported the woman received minor injuries. Rainfall rates of 0.5 to 0.7 inch from Fullerton to Rancho Cucamonga between 7-8 am. The main IVT frontal band moved through Southern California 7-10 AM.

Flash Flood in ORANGE, CALIFORNIA
From 11-DEC-22 10:00:00 to 11-DEC-22 12:00:00 (PST-8)
Location: SANTA ANA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Swiftwater rescue in the Santa Ana River at Garden Grove Blvd. The area received 0.5 to 1 inch of rain at the time of rescue. An adult male was successfully rescued but taken to the hospital. The main IVT frontal band moved through Southern California 7-10 AM.

High Wind in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 11-DEC-22 02:00:00 to 11-DEC-22 16:00:00 (PST-8)
Magnitude: 77.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong winds impacted the San Diego County Mountains from the morning on December 11 through that evening. The following are Mesonet observations from December 11:
Mesonet station HF001 Palomar Mountain Launch reported a peak wind gust of 89 mph.
Mesonet station HP029 Cuyamaca Peak reported a peak wind gust of 68 mph.
Mesonet station AT571 Palomar Mountain Lookout reported a peak wind gust of 61 mph.

High Wind in RIVERSIDE COUNTY MOUNTAINS, CALIFORNIA
From 11-DEC-22 00:00:00 to 11-DEC-22 08:00:00 (PST-8)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong winds impacted the Riverside County Mountains from early in the morning on December 11 into the late morning. The following are notable Mesonet wind gust reports:
Mesonet station Toro Peak reported a peak wind gust of 65 mph.
Mesonet station 010SE Cabazon (SCE1010) reported a peak wind gust of 63 mph.

Heavy Snow in RIVERSIDE COUNTY MOUNTAINS, CALIFORNIA
From 11-DEC-22 06:00:00 to 12-DEC-22 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

High-elevation snow impacted the Riverside County Mountains from the morning on December 11 through December 12. Snow accumulations of 2 to 4 inches were reported above 5000 feet. Light snow was reported as low as 2500 feet near Beaumont, but did not stick.

Heavy Snow in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 11-DEC-22 06:00:00 to 12-DEC-22 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

High-elevation snow impacted the San Bernardino County Mountains from the morning on December 11 through December 12. Snow accumulations of 2 to 8 inches were common at elevations above 4500 feet, with some notable amounts:
10 inches of snow near Running Springs
12-15 inches of snow at Snow Valley.
The Department of Highways reported three vehicles stuck in snow at 271 Fairway Drive, with as many as 80 vehicles stuck in snow on Highway 18, resulting in the closure of Highway 18 at Upper Waterman Canyon at 4000 feet.

High Wind in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 11-DEC-22 00:00:00 to 11-DEC-22 08:00:00 (PST-8)
Magnitude: 73.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High winds impacted the San Bernardino County Mountains on December 11, with the peak winds occurring from midnight through the mid-morning hours. Widespread wind gusts of 60 to 70 mph were observed, with local wind gusts over 80 mph reported. The following are notable wind gust reports:
Mesonet station 424SCE Silverwood Lake reported a peak wind gust of 84 mph.
Mesonet station SCE338 Cajon Lookout reported a peak wind gust of 77 mph.
Mesonet station SCE269 Cushenbury Springs reported a peak wind gust of 74 mph.

Dust Storm in APPLE AND LUCERNE VALLEYS, CALIFORNIA
From 11-DEC-22 00:00:00 to 11-DEC-22 03:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Victorville Airport reported 1/4 mile - 1 mile visibility in blowing dust for about two hours. The peak wind gust of 50 kt was reported at 2:55 AM.

Hail in SAN DIEGO, CALIFORNIA
From 12-DEC-22 06:00:00 to 12-DEC-22 06:00:00 (PST-8)
Location: NATIONAL CITY
Magnitude: 0.50 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail of pea size (0.25 inch) to 0.5 inch in diameter, with hail covering the road on Coronado. Accidents reported on Highway-75 between Nab Coronado and Leyte Road on the Silver Strand (Beach Highway). One vehicle flipped.

Flash Flood in RIVERSIDE, CALIFORNIA
From 11-DEC-22 16:00:00 to 12-DEC-22 13:00:00 (PST-8)
Location: PALM SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Palm Springs Police Department closed North Indian Canyon Drive through the Whitewater wash due to water over the road, with the closure reported at 4:26 PM and December 11, remaining closed through 1 PM on December 12. The Riverside County Mountains reported 1-2 inches of rain prior to the closure, and Palm Springs reported 0.23 inch.

Strong Wind in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 11-DEC-22 12:00:00 to 11-DEC-22 18:00:00 (PST-8)
Magnitude: 35.00 MG
Reported by: ASOS

United States Coast Guard cancelled the Parade of Lights boating event (start time 5:30 pm). Wind was gusting to 40 mph with heavy rain reported at North Island at noon when the frontal system moved through.