An atmospheric river (300-400 IVT) brought widespread heavy rain to Southern California on April 6th. A few showers lingered into April 7th, but it was low impact. A warm front moved through the region on April 8th and brought waves of showers from south to north, with persistent heavy snow in the San Bernardino Mountains. Following the warm front, an upper low moved into the California Bight and stalled on April 9th, bringing 3 to 5 inches of rain to Orange County and San Diego County through the 10th. Numerous flash floods and floods occurred, especially in coastal cities. The San Diego River at Fashion Valley reached 12.5 feet (minor flood stage). Many locations recorded their highest daily rainfall record: San Diego (1.98), Chula Vista (1.56), and Vista (3.18). Oceanside Harbor recorded their wettest 24-hours on record with 3.06.

Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 08:00:00 to 10-APR-20 10:00:00 (PST-8)
Location: LAKE SAN MARCOS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS Employee reports flooding at W San Marcos Blvd at Discovery Street.

Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 11:00:00 to 10-APR-20 13:00:00 (PST-8)
Location: NORTH PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

San Diego Fire and lifeguards rescued 2 people that drove their Jeep into a drainage ditch on Chollas Creek. Both people were rescued. The creek was within its banks.

Debris Flow in SAN DIEGO, CALIFORNIA
From 10-APR-20 17:00:00 to 10-APR-20 20:00:00 (PST-8)
Location: CARDIFF BY THE SEA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A debris flow occurred on El Camino Real at Tennis Club Drive in Encinitas. The entire road was covered in mud and debris.

Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 10:00:00 to 10-APR-20 16:00:00 (PST-8)
Location: UNIVERSITY HGTS
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Employee

In addition to the 6 am to 11 am closures on Fashion Valley road and Avenida Del Rio further west on the San Diego River when it was exceeding 9.5 feet, from 1130 am to 2 pm, San Diego river rises to 12 feet as heavy rain showers continued. Upstream closures by police expanded to Qualcomm Way, Mission Center Road, along Camino De La Reina at the Highway 163 underpass, Camino Del Este crossing, as well as Ward road (Mission San Diego station) and Grantville trolly station (barricades set up) and north to the San Diego Mission road crossing gate closure - river reached a peak of 12.5 feet at 6 pm. Between noon and 2 pm swift water rescues were observed along the river east of Mission Center road. Storm survey conducted during this period.

Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 09:00:00 to 10-APR-20 15:00:00 (PST-8)
Location: FALLBROOK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Water rising and flooding on Sandia Creek into the Santa Margarita River. 1-2 feet of water reported flowing over Sandia Creek Drive via SDCFCD webcam.

Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 09:00:00 to 10-APR-20 15:00:00 (PST-8)
Location: PAUMA VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

San Luis Rey River and tributaries caused flooding across Cole Grade Road, where the road was closed from the low water crossing to Route 76.

Flash Flood in ORANGE, CALIFORNIA
From 06-APR-20 09:00:00 to 06-APR-20 11:00:00 (PST-8)
Location: LA JOLLA
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rainfall rates over 0.70 per hour caused 8 inches of swift moving water to flood Lakeview Ave, just north of Miraloma Ave.

Flash Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 09:00:00 to 10-APR-20 13:00:00 (PST-8)
Location: JESMOND DENE
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Department of Highways

Flash flooding and boulders reported on roads in Valley Center. Area received 4 inches of rain in about 12 hours.

Flash Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 08:00:00 to 10-APR-20 11:00:00 (PST-8)
Location: BONSALL
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

A car sized boulder was reported on a road in Bonsall. This area had received 3 inches of rain in the past 12 hours and still heavy rainfall occurring at the time.

Debris Flow in SAN DIEGO, CALIFORNIA
From 10-APR-20 08:00:00 to 10-APR-20 10:00:00 (PST-8)
Location: GRANTVILLE
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Interstate 8 landslide and debris on highway caused closure.

Strong Wind in ORANGE COUNTY COASTAL, CALIFORNIA
From 06-APR-20 06:00:00 to 06-APR-20 10:00:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Orange County Register photo of large tree that crush a truck. Combination of winds and heavy rainfall appear to cause the tree to topple over.

Flash Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 15:00:00 to 10-APR-20 18:00:00 (PST-8)
Location: CARLSBAD
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Emergency Manager

City of Oceanside had significant damage to the wastewater treatment plant. Estimated up to 2 millions gallons spilled as the plant was inundated by the flash flooding of Buena Vista Creek.

Heavy Snow in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 06-APR-20 21:00:00 to 10-APR-20 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Reports of heavy snow throughout the San Bernardino Mountains starting the evening of April 6th and continuing through April 10th. In Arrowbear, 37 inches of snow was reported. Mountain High received 34 inches. Snow Valley received 30 inches. Snow Summit (Bear Mountain) received 28 inches. Green Valley Lake received 33 inches. Barton Flats received 29 inches.

Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 09:00:00 to 10-APR-20 13:00:00 (PST-8)
Location: OVERLOOK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Riverleaf Inn in Mission Valley was surrounded by flood waters as the San Diego River reached minor flood stage. 80 persons were displaced from the hotel as it was uninhabitable.

Flash Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 17:00:00 to 10-APR-20 19:00:00 (PST-8)
Location: ENCINITAS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Local Official

Flash flooding and debris on Encinitaas Blvd at Quail Gardens Road. Power lines fell into the water and were hazardous.

Flash Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 17:00:00 to 10-APR-20 21:00:00 (PST-8)
Location: ENCINITAS
Flood cause: Heavy Rain
Property damage: 70.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Encinitas Police Department is reporting 12 incidents of flooding and flash flooding in Encinitas. Several people have been evacuated from homes in the Encinitas Blvd/Quail Gardens Road area. Twenty persons evacuated from a nursing home. Debris flow also in flooded area up to window of structure at Sunshine Gardens Apartments.

Flood in RIVERSIDE, CALIFORNIA
From 07-APR-20 14:00:00 to 07-APR-20 18:00:00 (PST-8)
Location: GARNET
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Indian Canyon Drive temporarily closed at the Whitewater Wash due to flooding (1-5 inches of water over the road) caused from rain runoff down the mountains.

Debris Flow in SAN DIEGO, CALIFORNIA
From 09-APR-20 08:00:00 to 09-APR-20 12:00:00 (PST-8)
Location: RANCHO BERNARDO
Flood cause: Heavy Rain
Property damage: 2000.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Mudslide under a home spilled onto Black Mountain Road in Rancho Penasquitos, closing part of the road and causing stress to owner's house and property.

Debris Flow in SAN DIEGO, CALIFORNIA
From 10-APR-20 10:05:00 to 10-APR-20 13:00:00 (PST-8)
Location: PACIFIC BEACH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Flooding on I-5 northbound offramp to Garnet/Grand Streets causing the ramp to temporarily close.

Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 13:20:00 to 10-APR-20 16:00:00 (PST-8)
Location: LA PRESA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Southbound on-ramp for Route 125 from Paradise Valley Rd closed due to flooding.

Debris Flow in SAN DIEGO, CALIFORNIA
From 10-APR-20 14:46:00 to 10-APR-20 18:46:00 (PST-8)
Location: BONSALL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Several boulders completely blocking southbound lane and partially blocking northbound lane. Area has seen just over an inch of rain over 6 hours.

Flash Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 07:30:00 to 10-APR-20 11:30:00 (PST-8)
Location: MISSION BEACH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Media reported and had video of water above vehicle tires and streets flooded. Flood prone area but they received 1.8 inches of rain in 24 hours on saturated grounds.

Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 16:00:00 to 10-APR-20 19:00:00 (PST-8)
Location: SAN DIEGO MUNI BROWN
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Swift water rescue of a pregnant women and pets near or in Otay River. Rescue occurred in dark and may have been homeless camp. Heavy rainfall had ended but river was running fast and swift at bank full levels.

Flash Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 09:00:00 to 10-APR-20 22:00:00 (PST-8)
Location: CARLSBAD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Buena Vista Creek left its banks and flooded an entire golf driving range and 3 lanes of highway 78 eastbound. At 2 pm, despite efforts to pump water away, Caltrans and CHP closed all 3 lanes of westbound Highway 78. A sig alert was issued around 930 am. The highway was not fully reopen until 10 pm Friday.

Flood in ORANGE, CALIFORNIA
From 06-APR-20 08:00:00 to 06-APR-20 11:00:00 (PST-8)
Location: COSTA MESA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Widespread urban flooding reported throughout Costa Mesa with water on roadways and some fast moving shallow water.

Flood in ORANGE, CALIFORNIA
From 06-APR-20 09:00:00 to 06-APR-20 11:00:00 (PST-8)
Location: PERALTA HILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Flooding in lanes 3 and 4 on Hwy 55 near Yorba Linda.

Flood in ORANGE, CALIFORNIA
From 06-APR-20 05:45:00 to 06-APR-20 07:45:00 (PST-8)
Location: CYPRESS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Orange County Register reported a swift water rescue in Coyote Creek channel near Buena Park. Person was yelling for help and the fire department was called. 3 feet of moving water was reporting in the canal near 4600 Minorca avenue.

Heavy Rain in ORANGE, CALIFORNIA
From 06-APR-20 10:00:00 to 06-APR-20 11:00:00 (PST-8)
Location: SAN JUAN CAPISTRANO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Near 1 inch of rain in 20 minutes in San Juan Capistrano.

Heavy Rain in ORANGE, CALIFORNIA
From 06-APR-20 10:00:00 to 06-APR-20 11:00:00 (PST-8)
Location: SILVERADO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

In Silverado Canyon, 0.88 of rain was reported in 1 hour from 2 gages.

Heavy Rain in SAN BERNARDINO, CALIFORNIA
From 06-APR-20 06:00:00 to 06-APR-20 12:00:00 (PST-8)
Location: SCOTLAND
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Lytle Creek reported 3 inches of rain in 6 hours between 0600 and 1200 PST on April 6th.

Debris Flow in SAN BERNARDINO, CALIFORNIA
From 06-APR-20 12:00:00 to 06-APR-20 15:00:00 (PST-8)
Location: CRESTLINE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Rock slide at Highway 18 and Highway 138 near Crestline. Rocks were covering both sides of the road.

Debris Flow in SAN BERNARDINO, CALIFORNIA
From 06-APR-20 14:00:00 to 06-APR-20 16:00:00 (PST-8)
Location: BALDWIN LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Large rocks in lane on Highway 38.

Flood in RIVERSIDE, CALIFORNIA
From 06-APR-20 16:00:00 to 06-APR-20 18:00:00 (PST-8)
Location: SUNNYMEAD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Westbound lanes of Highway 60 in Moreno Valley heavily flooded.

Flood in SAN DIEGO, CALIFORNIA
From 07-APR-20 13:00:00 to 07-APR-20 15:00:00 (PST-8)
Location: (MYF)MNTGMRY FLD SAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to 12 inches of standing water was reported on Aero Drive in Kearny Mesa.

Strong Wind in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 07-APR-20 17:00:00 to 07-APR-20 19:00:00 (PST-8)
Magnitude: 35.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Coast Guard

Gusty winds (estimated 40 mph) prevented the Coast Guard from towing in a 25-foot distressed boat to shore in Encinitas.

Flood in SAN BERNARDINO, CALIFORNIA
From 07-APR-20 21:00:00 to 07-APR-20 23:00:00 (PST-8)
Location: ADELANTO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Turner Road was closed due to flooding.

Flood in ORANGE, CALIFORNIA
From 06-APR-20 06:00:00 to 06-APR-20 07:00:00 (PST-8)
Location: LOS ALIMITOS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Swift water rescue occurred in Seal Beach, near Westminister Blvd in a drainage canal.

Heavy Snow in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 06-APR-20 21:00:00 to 10-APR-20 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A few inches of snow fell in the San Diego County mountains between April 6th and 10th. Palomar Mountain received 6.5 inches of snow. Mount Laguna received 4 inches of snow.

Flood in SAN DIEGO, CALIFORNIA
From 10-APR-20 06:00:00 to 10-APR-20 08:00:00 (PST-8)
Location: DEL DIOS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Around 6 AM, firefighters were dispatched to Harmony Grove Road, where 4 people, 3 dogs and 1 cat were trapped in the swiftly flowing Escondido Creek. Everyone was rescued and accounted for.