Tropical Storm Hilary made landfall across northern Baja California on August 20, and moved through Southern California that afternoon and evening. Torrential rainfall occurred across mountain and desert communities, resulting in catastrophic flash flooding and debris flows, damaged railways and bridges, and the closing of major interstates including I-8 in San Diego County and I-10 in Riverside County. Widespread tropical-storm force winds were recorded across much of Southern California.

Flash Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 12:51:00 to 21-AUG-23 13:30:00 (PST-8)
Location: MECCA
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A swift water rescue was conducted on Box Canyon Road in Mecca.

Flash Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 12:00:00 to 20-AUG-23 14:00:00 (PST-8)
Location: OWL
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple reports of roadway flooding on I-10 in Cabazon.

Flash Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 13:30:00 to 20-AUG-23 15:30:00 (PST-8)
Location: COACHELLA
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Two vehicles were stuck in rushing water on Dillon Road and Landfill Road.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 20-AUG-23 11:30:00 to 20-AUG-23 13:30:00 (PST-8)
Location: WRIGHTWOOD
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Video received from this area near Sheep Creek showing boulders, rocks, and high water over State Highway 2 after 6.23 inches of rain fell. Time is estimated.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 20-AUG-23 14:00:00 to 20-AUG-23 16:00:00 (PST-8)
Location: FOREST FALLS
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Video received from Potato Canyon in Oak Glen of mud and rocks across the roadway. Mud and rocks surround a residence in Oak Glen following a debris flow. Widespread rocks and mud covers many roadways in the town.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 20-AUG-23 15:00:00 to 20-AUG-23 17:00:00 (PST-8)
Location: SUGARLOAF
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Portions of State Highway 38 near the Heart Bar Campground were washed out.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 20-AUG-23 16:00:00 to 20-AUG-23 19:00:00 (PST-8)
Location: SEVEN OAKS
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thirty residents in Seven Oaks were cut off from rescue after the Santa Ana River overflowed and Glass Road was damaged. One person was missing at the time of report, potentially washed into Barton Creek. Seven Oaks Road was closed for Emergency Crews.

Flash Flood in SAN DIEGO, CALIFORNIA
From 20-AUG-23 12:00:00 to 20-AUG-23 13:30:00 (PST-8)
Location: DESERT LODGE
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Highway 78 was washed out at Yaqui Pass.

Flood in SAN DIEGO, CALIFORNIA
From 20-AUG-23 05:00:00 to 21-AUG-23 12:00:00 (PST-8)
Location: OVERLOOK
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

San Diego Swiftwater Rescue Lifeguard and Fire Department reported 14 rescues on Sunday 8/20. The San Diego River reached 9.8 feet with a very rapid rise after the watershed received 1.5 to 3.0 inches of rainfall.

Flood in SAN DIEGO, CALIFORNIA
From 20-AUG-23 10:00:00 to 20-AUG-23 12:00:00 (PST-8)
Location: MOUNTAIN SPG
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Debris, rocks, and mud reported on In Ko Pah Road.

Tropical Storm in SANTA ANA MOUNTAINS AND FOOTHILLS, CALIFORNIA
From 20-AUG-23 07:00:00 to 21-AUG-23 00:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the early overnight hours into August 21. The following are the top wind gusts reported across the Santa Ana Mountains and Foothills:
Santiago Peak: 65 MPH (1:45 PM 08/20)
Corona RAWS: 56 MPH (12:11 AM 08/21)
Fremont Canyon: 56 MPH (7:51 PM 08/20)
Pleasants Peak (SCE1534): 55 MPH (12:20 PM 08/20)
Pleasants Peak: 55 MPH (9:56 AM 08/20)
Case Springs: 54 MPH (11:22 PM 08/20 )
Temescal: 53 MPH (12:41 AM 08/21)
Lake Elsinore Vista (SCE084): 52 MPH (6:50 PM 08/20)
Camp Pendleton: 49 MPH (11:28 AM 08/20)
El Cariso RAWS: 48 MPH (11:20 PM 08/20).

Tropical Storm in SAN GORGONIO PASS NEAR BANNING, CALIFORNIA
From 20-AUG-23 08:00:00 to 20-AUG-23 18:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the early overnight hours into August 21. The following are the top wind gusts reported across the San Gorgonio Pass Near Banning:
Whitewater RAWS: 70 MPH (5:50 PM 08/20)
Whitewater (SCE1015):67 MPH (6:10 PM 08/20)
Banning (SCE1645):  57 MPH (5:20 PM 08/20)
Cabazon (SCE1445): 56 MPH (5:00 PM 08/20)
Desert Hot Springs (SCE643): 56 MPH (6:10 PM 08/20)
Cabazon: 54 MPH (5:14 PM 08/20)
Banning North (SCE114): 54 MPH (2:50 PM 08/20)
Whitewater Cyn (SCE363): 54 MPH (6:20 PM 08/20)
Snowcreek Cyn (SCE577): 54 MPH (5:50 PM 08/20)
Morongo Valley (SCE287): 53 MPH (6:40 PM 08/20)
Desert Hot Springs (SCE566): 53 MPH (6:20 PM 08/20)
Cabazon (SCE1010): 52 MPH (4:30 PM 08/20)
Stubbe Cyn (SCE1161): 51 MPH (5:20 PM 08/20)
San Gorgonio Pass (SCE1464): 51 MPH (4:30 PM 08/20)
Desert Hot Springs (SGXWFO): 51 MPH (6:45 PM 08/20)
Desert Hot Springs (SCE561): 51 MPH (6:10 PM 08/20)
Whitewater South (SCE586): 51 MPH (4:50 PM 08/20)
Millard Pass (SCE884): 51 MPH (4:20 PM 08/20)
Beaumont (SCE1139): 50 MPH (9:20 AM 08/20)
Banning (SCE635): 50 MPH (5:20 PM 08/20).

Tropical Storm in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 20-AUG-23 05:00:00 to 20-AUG-23 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the early overnight hours into August 21. The following are the top wind gusts reported across the San Diego County Mountains.
Big Black Mountain: 84 MPH (1125 AM 08/20)
Palomar Mtn Lookout: 79 MPH (6:05 AM 08/20)
West San Ysabel (SDGE): 71 MPH (9:50 AM 08/20)
Sill Hill (SDGE): 70 MPH (8:50 AM 08/20)
Harrison Park (SDGE): 68 MPH (1:50 PM 08/20)
Hoskings Ranch (SDGE): 67 MPH (11:50 AM 08/20)
Boulder Creek (SDGE): 65 MPH (6:00 AM 08/20)
Mt Laguna Observatory: 63 MPH (6:45 AM 08/20)
Pine Valley - Horse Launch: 62 MPH (12:45 PM 08/20)
Lake Cuyamaca: 60 MPH (1:30 PM 08/20)
Birch Hill: 60 MPH  (8:48 AM 08/20)
Lucky Five Ranch (SDGE): 60 MPH (9:00 AM 08/20)
Mataguay (SDGE): 60 MPH (11:00 AM 08/20)
North Descanso (SDGE): 60 MPH (7:50 AM 08/20)
Buckman Springs (SDGE): 59 MPH (11:20 AM 08/20)
Crestwood (SDGE): 59 MPH (8:00 AM 08/20)
Morena Dam: 57 MPH (12:00 PM 08/20)
La Posta (SDGE): 57 MPH (9:00 AM 08/20)
School House Cyn (SDGE): 57 MPH (9:10 AM 08/20)
Lake Cuyamaca (SDGE): 56 MPH (2:10 PM 08/20)
Mesa Grande (SDGE): 56 MPH (11:10 AM 08/20)
Warners (SDGE):  56 MPH (9:50 AM 08/20)
Chihuahua Valley (SDGE): 55 MPH (2:20 PM 08/20)
East Warners (SDGE): 55 MPH (3:10 PM 08/20)
Sky Oaks: 54 MPH (1:44 PM 08/20)
Sherilton Valley: 54 MPH (12:00 PM 08/20)
Descanso North: 53 MPH (10:27 AM 08/20)
Boulevard West (SDGE): 52 MPH (10:10 AM 08/20)
White Star: 52 MPH (9:18 AM 08/20)
Ranchita (SDGE): 52 MPH (2:20 PM 08/20)
Viejas Grade (SDGE): 52 MPH (10:50 AM 08/20)
West Wynola (SDGE): 52 MPH (8:40 AM 08/20)
Oak Grove: 51 MPH (6:13 PM 08/20)
Wynola (SDGE): 51 MPH (11:50 AM 08/20).
A large oak tree was downed near Julian, blocking lanes on Wynola Road near Highway 78.

Tropical Storm in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 20-AUG-23 07:00:00 to 20-AUG-23 22:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the early overnight hours into August 21. The following are the top wind gusts reported across the San Diego County Valleys:
Hauser Mountain: 78 MPH (8:20 AM 08/20)
Hellhole Canyon (SDGE): 70 MPH (11:40 AM 08/20)
Dye Mountain (SDGE): 69 MPH (9:20 AM 08/20)
Poomacha (SDGE): 67 MPH (9:20 AM 08/20)
Round Potrero (SDGE): 65 MPH (9:00 AM 08/20)
Cuca Ranch (SDGE): 64 MPH (11:40 AM 08/20)
Witch Creek (SDGE): 63 MPH (9:20 AM 08/20)
Santa Ysabel Ranch (SDGE): 62 MPH (10:40 AM 08/20)
Mateo Ridge: 61 MPH (11:22 PM 08/20)
Talega Ridge: 60 MPH (11:22 PM 08/20)
Rockwood (SDGE): 58 MPH (12:20 PM 08/20)
Otay Mountain (SDGE): 57 MPH (12:20 PM 08/20)
Santa Teresa Valley (SDGE): 57 MPH (11:30 AM 08/20)
Alpine RAWS: 55 MPH (9:52 AM 08/20)
East Willows (SDGE): 54 MPH (11:30 AM 08/20)
Mt Woodson: 54 MPH (9:50 PM 08/20)
Otay Mountain RAWS: 54 MPH (1:14 PM 08/20)
Anderson Valley (SDGE): 53 MPH (11:30 AM 08/20)
Thundernut: 53 MPH (12:20 PM 08/20)
Fallbrook RAWS: 52 MPH (10:22 PM 08/20)
San Miguel: 52 MPH (6:27 PM 08/20)
Coronado Hills: 52 MPH (10:08 PM 08/20)
North Potrero (SDGE): 52 MPH (10:50 AM 08/20)
Skye Valley: 51 MPH (9:00 AM 08/20)
Escondido (SDGE): 50 MPH (12:00 PM 08/20)
Potrero (SDGE): 50 MPH (10:30 AM 08/20).

Tropical Storm in SAN DIEGO COUNTY DESERTS, CALIFORNIA
From 20-AUG-23 12:00:00 to 20-AUG-23 16:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the early overnight hours into August 21. The following are the top wind gusts reported across the San Diego County Deserts:
In Ko Pah (SDGE): 54 MPH (1:30 PM 08/20)
Borrego Valley Airport: 49 MPH (4:15 PM 08/20)
Borrego (SDGE): 43 MPH (4:00 PM 08/20).
A semi trailer was overturned by strong winds in the early evening hours on August 20 near Borrego Springs.

Tropical Storm in SAN DIEGO COUNTY COASTAL AREAS, CALIFORNIA
From 20-AUG-23 16:00:00 to 20-AUG-23 21:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the evening. The following are the top wind gusts reported across the San Diego County coastal areas:
Camp Pendleton: 52 MPH (5:51 PM 08/20)
Las Flores: 50 MPH (10:22 PM 08/20)
Camp Pendleton South: 48 MPH (10:23 PM 08/20)
North Island NAS: 47 MPH (5:08 PM 08/20)
Bay Park 2: 47 MPH (9:38 PM 08/20)
Petco Park: 44 MPH (5)25 PM 08/20)
Miramar MCAS: 43 MPH (5:31 PM 08/20)
Tecolote Canyon (SDGE): 43 MPH (9)20 PM 08/20)
Oceanside Airport: 40 MPH (5:44 PM 08/20)
La Jolla Heights (SDGE): 40 MPH (5:20 PM 08/20)
Point Loma: 40 MPH (9:28 PM 08/20).

Tropical Storm in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 20-AUG-23 08:00:00 to 21-AUG-23 00:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the early overnight hours into August 21. The following are the top wind gusts reported across the Inland Empire:
Highland Springs: 60 MPH (9:16 AM 08/20)
Homeland (SCE757): 56 MPH (8:50 PM 08/20)
Beaumont (SCE1646): 52 MPH (9:00 AM 08/20)
Wildomar (SCE1359): 51 MPH (10:40 PM 08/20)
Box Springs Mtn (SCE268): 51 MPH (9:40 PM 08/20)
Grand Terrace (SCE925): 51 MPH (10:00 PM 08/20)
Sage East (SCE074): 50 MPH (2:20 PM 08/20)
Calimesa (SCE1233): 49 MPH (4:20 PM 08/20)
Cherry Valley (SCE1238): 49 MPH (5:30 PM 08/20)
Brown Canyon (SCE480): 49 MPH (4:40 PM 08/20).

Tropical Storm in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 20-AUG-23 08:00:00 to 21-AUG-23 03:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the early overnight hours into August 21. The following are the top wind gusts reported across the San Bernardino County Mountains:
Sce Silverwood West: 80 MPH (10:30 PM 08/20)
Pigsah Peak (SCE085): 79 MPH (4:20 PM 08/20)
Silverwood Lake (SCE1424): 75 MPH (10:40 PM 08/20)
Burns Canyon: 71 MPH (5:51 PM 08/20)
Cajon Lookout (SCE338): 65 MPH (11:00 PM 08/20)
Snow Peak (SCE1045): 62 MPH (5:00 PM 08/20)
Banning RAWS: 61 MPH (5:13 PM 08/20)
Waterman Cyn 2 (SCE623): 61 MPH (9:50 PM 08/20)
Crestline (SCE550): 57 MPH (9:20 PM 08/20)
Pilot Rock (SCE1017): 55 MPH (12:50 AM 08/21)
Edgar Canyon (SCE1158): 54 MPH (4:20 PM 08/20)
Hesperia (SCE358): 54 MPH (1030 PM 08/20)
Lake Arrowhead (SCE798): 54 MPH (10:00 PM 08/20)
Hesperia South (SCE1061): 53 MPH (12:30 AM 08/21)
Panorama Point (SCE1106): 53 MPH (9:50 PM 08/20)
Running Springs (SCE1221): 53 MPH (9:30 PM 08/20)
Phelan (SCE336): 53 MPH (1:20 AM 08/21)
Banning (SCE670): 53 MPH (4:00 PM 08/20)
Lake Arrowhead (SCE342): 52 MPH (9:20 PM 08/20)
Crestline (SCE359): 52 MPH (11:10 PM 08/20)
Lake Arrowhead (SCE364): 52 MPH (9:40 PM 08/20)
Crestline (SCE653): 52 MPH (10:20 PM 08/20)
Lake Arrowhead (SCE742): 52 MPH (9:40 PM 08/20)
Wildwood Cyn (SCE1159): 51 MPH (9:10 AM 08/20)
Oak Glen (SCE1088): 50 MPH (5:00 PM 08/20)
Marshall Peak (SDHGPA): 50 MPH (10:30 PM 08/20)
Skyforest Hwy 18 (SCE357): 50 MPH (10:30 PM 08/20).
A tree was downed southeast of Big Bear Lake, blocking lanes of a highway.

Tropical Storm in RIVERSIDE COUNTY MOUNTAINS, CALIFORNIA
From 20-AUG-23 07:00:00 to 20-AUG-23 20:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the evening. The following are the top wind gusts reported across the Riverside County Mountains:
Pine Cove Rocky Point: 62 MPH (3:00 PM 08/20)
Apple Canyon (SCE376): 60 MPH (3:30 PM 08/20)
Red Mountain (SCE248): 59 MPH (3:40 PM 08/20)
San Marcos 3: 58 MPH (4:17 PM 08/20)
Chimney Flats (SCE247): 56 MPH (12:00 PM 08/20)
Keen Ridge (SCE375): 55 MPH (3:20 PM 08/20)
Twin Pines (SCE035): 52 MPH (10:10 AM 08/20)
Anza: 51 MPH (2:54 PM 08/20)
Pine Cove (SCE1170): 48 MPH (8:20 AM 08/20)
Pine Cove Water Office: 45 MPH (3:45 PM 08/20)
Idyllwild (SCE002): 45 MPH (3:40 PM 08/20).

Tropical Storm in ORANGE COUNTY INLAND, CALIFORNIA
From 20-AUG-23 17:00:00 to 21-AUG-23 00:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the early morning hours on August 21. The following are the top wind gusts reported across Orange County Inland areas:
San Clemente Ridge (SDGE): 57 MPH (6:20 PM 08/20)
San Clemente: 53 MPH (5:55 PM 08/20)
Chino Hills: 52 MPH (6:57 PM 08/20)
Baker Canyon (SCE097): 48 MPH (12:00 AM 08/21)
Chino Hills: 47 MPH (12:08 AM 08/21)
Upper Bell: 47 MPH (6:26 PM 08/20)
Limestone Cyn (SCE1114): 43 MPH (6:50 PM 08/20)
Villa Park Dam (SCE128): 43 MPH (7:20 PM 08/20)
Gypsum Canyon (SCE127): 41 MPH (12:00 AM 08/21).
Trees and large tree branches fell along the Santa Ana river, Riverview Golf Course, and in La Habra. Reports of winds removing shingles from houses in La Habra. 190 customers lost power during the event.

Tropical Storm in ORANGE COUNTY COASTAL, CALIFORNIA
From 20-AUG-23 17:00:00 to 21-AUG-23 00:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from early morning on August 20 through the early overnight hours into August 21. The following are the top wind gusts reported across the Orange County coastal areas:
Laguna Beach 4 (SE024): 61 MPH (6:50 PM 08/20)
Laguna Niguel 2: 47 MPH (6:50 PM 08/20)
Huntington Beach Pier: 47 MPH (6:52 PM 08/20)
Signal Peak: 45 MPH (12:56 AM 08/21)
Moro Canyon (SCE803): 43 MPH (6:10 PM 08/20)
Newport Pier: 43 MPH (12:16 AM 08/21)
Aliso Viejo (SCE1285): 40 MPH (6:40 PM 08/20)
Moro Cyn Trail (SCE1626): 40 MPH (6:00 PM 08/20).

Tropical Storm in COACHELLA VALLEY, CALIFORNIA
From 20-AUG-23 15:00:00 to 21-AUG-23 17:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California on August 20. The following are the top wind gusts reported across the Coachella Valley:
Palm Desert 1: 57 MPH (4:55 PM 08/20)
Palm Springs Tram (SCE361): 57 MPH (5:00 PM 08/20)
Cathedral Canyon: 56 MPH (5:52 PM 08/20)
Mecca: 56 MPH (4:56 PM 08/20)
Palm Springs Airport: 48 MPH (6:27 PM 08/20)
Palm Desert (SCE416): 46 MPH (4:20 PM 08/20)
Palm Springs (SCE638): 46 MPH (5:00 PM 08/20)
I-10 - West Of Date Palm Drive:  44 MPH (4:45 PM 08/20)
Palm Desert:  42 MPH (5:26 PM 08/20)
Indio: 41 MPH (6:15 PM 08/20)
Cathedral City (SCE855): 41 MPH (5:50 PM 08/20).
A large tree was downed in Palm Desert, blocking the eastbound lanes of Route 111, partially closing the road. Other trees were downed along Monterey Ave in Palm Desert. The awning on a Starbucks was downed in Palm Desert.

Tropical Storm in APPLE AND LUCERNE VALLEYS, CALIFORNIA
From 20-AUG-23 17:00:00 to 21-AUG-23 03:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

Tropical Storm Hilary produced widespread tropical storm-force winds across Southern California from August 20 through the early overnight hours into August 21. The following are the top wind gusts reported across the High Desert:
Victorville (7NE): 59 MPH (2:00 AM 08/21)
Hesperia (SCE340): 57 MPH (1:10 AM 08/21)
Hesperia (SCE617): 51 MPH (10:50 PM 08/20)
Phelan (SCE335): 50 MPH (8:00 PM 08/20)
Hesperia South (SCE1037): 49 MPH (10:20 PM 08/20)
Oak Hills (SCE1020): 47 MPH (12:20 AM 08/21)
Burns Canyon Rd (SCE286): 47 MPH (10:00 PM 08/20)
Pioneertown (SCE347): 47 MPH (9:40 PM 08/20)
Phelan (SCE1452): 46 MPH (10:50 PM 08/20)
Lucerne Valley (SCE266): 46 MPH (12:40 AM 08/21).

Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 08:00:00 to 20-AUG-23 10:00:00 (PST-8)
Location: CATHEDRAL CITY
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Fourteen residents at an assisted living facility were rescued by bucket loaders when mud and water over a foot deep surrounded their homes on Date Palm Drive in Cathedral City.

Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 23:00:00 to 21-AUG-23 01:00:00 (PST-8)
Location: MYOMA
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

CalTrans report of roadways near Ramon Road and Thousand Palms Canyon Road completely submerged.

Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 15:00:00 to 20-AUG-23 17:00:00 (PST-8)
Location: MURRIETA
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported flooding in the streets of Old Town Murrieta near the Santa Ana foothills.

Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 14:00:00 to 20-AUG-23 16:00:00 (PST-8)
Location: BOX SPGS
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported flooding at I-215 and MLK Boulevard.

Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 13:00:00 to 20-AUG-23 15:00:00 (PST-8)
Location: EDGEMONT
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported flooding near Moreno Valley Freeway and Frederick Street.

Heavy Rain in SAN BERNARDINO, CALIFORNIA
From 19-AUG-23 20:00:00 to 22-AUG-23 06:00:00 (PST-8)
Location: WRIGHTWOOD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy rain associated with Tropical Cyclone Hilary impacted much of San Bernardino County starting late on August 19th. The heaviest rainfall occurred on August 20th which led to numerous reports of flash flooding and debris flows. Light rainfall continued through the 21st as well. The heaviest rainfall occurred in the San Bernardino County Mountains, where anywhere from about 2.00-6.00 of rain fell on average. Heavier amounts include 13.07 at Upper Mission Creek (UMCC1), 10.34 at Crestline (CA-SR-84), 9.71 at the Lytle Creek RAWS site, 8.23 at Running Springs, 6.92 at Wrightwood (CA-SR-69), and 6.44 at Forest Falls (FFPC1). Rainfall totals in the Apple and Lucerne Valleys generally ranged from 1.00-3.00. Notable higher totals in this area include Mojave Forks Dam southeast of Hesperia (MVDC1) receiving 6.43 of rain, and Phelan (CW6479) receiving 3.74. Rainfall totals farther south across the Inland Empire generally ranged from 1.50-3.50. The Devore Fire Station observed a localized higher rainfall total of 4.24.

Heavy Rain in RIVERSIDE, CALIFORNIA
From 19-AUG-23 20:00:00 to 22-AUG-23 06:00:00 (PST-8)
Location: PRADO DAM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy rain associated with Tropical Cyclone Hilary impacted much of Riverside County starting late on August 19th. The heaviest rainfall occurred on August 20th which led to numerous reports of flash flooding and debris flows. Light rainfall continued through the 21st as well. The heaviest rainfall occurred in the Riverside County Mountains, where anywhere from about 2.00-6.00 of rain fell on average. Heavier amounts include 11.75 at Mount San Jacinto (MSJC1), 8.24 at Sky Valley (EW3393).
Rainfall totals in the Coachella Valley generally ranged from 3.00-6.00. Notable rainfall totals where more extreme impacts occurred include 4.32 at Cathedral City (FW8322), 4.02 at Palm Desert (GW2765), and 3.23 at Palm Springs International Airport.
Rainfall totals farther west across the Inland Empire generally ranged from 1.00-3.00. Notable higher totals in this area include 5.27 at Wildomar (1161D), 4.19 at Murrieta (FW8806), 3.59 at Lake Elsinore (FW0823), and 3.34 at Cabazon (BAZC1).

Heavy Rain in ORANGE, CALIFORNIA
From 19-AUG-23 20:00:00 to 22-AUG-23 06:00:00 (PST-8)
Location: DISNEYLAND
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy rain associated with Tropical Cyclone Hilary impacted much of Orange County starting late on August 19th. The heaviest rainfall occurred on August 20th which led to numerous reports of flash flooding and debris flows. Light rainfall continued through the 21st as well. The heaviest rainfall occurred in the Santa Ana Mountains, where anywhere from about 2.00-4.00 of rain fell on average. Heavier amounts include 4.53 of rain at Upper Harding Canyon (UHCC1), 4.17 at Santiago Peak (SAOC1), and 4.09 at both Horsethief Canyon (HTFC1) and Upper Silverado Canyon (SDOC1). Rainfall totals across inland Orange County as well as along the coast generally ranged from 1.00-3.00. Localized higher totals of 5.14 occurred in Huntington Beach (CW1521) and also north of Mission Viejo (MSTC1) where 3.42 of rain fell.

Heavy Rain in SAN DIEGO, CALIFORNIA
From 19-AUG-23 20:00:00 to 22-AUG-23 06:00:00 (PST-8)
Location: (NRS)NAF IMPERIAL BE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy rain associated with Tropical Cyclone Hilary impacted much of San Diego County starting late on August 19th. The heaviest rainfall occurred on August 20th which led to numerous reports of flash flooding and debris flows. Light rainfall continued through the 21st as well. The heaviest rainfall occurred in the San Diego County Mountains, where anywhere from about 3.00-6.00 of rain fell on average. Heavier amounts include 6.67 of rain at Palomar Mountain (PRMC1), 6.64 at Mount Laguna Observatory (MLGC1), and 6.08 at Ranchita (RCHC1).
Rainfall totals across the San Diego County Deserts generally ranged from 1.00-2.30. Notable totals include 2.25 of rain at San Felipe (SFVC1), 2.20 of rain at Anza Borrego Desert Park (UCAB), and 1.55 of rain at Ocotillo Wells (OCWC1).
Rainfall totals across the San Diego County Valleys ranged from 1.50-3.60. Notable totals from this region include 3.56 of rain at Valley Center (CW9939), 3.51 at Lake Wohlford (WHLC1), 3.47 of rain in Fallbrook, 3.10 of rain in Escondido (EW6576), 2.42 in Poway (CA-SD-12), and 2.23 in Ramona (CA-SD-186).
Rainfall totals across the San Diego County coastal and beach areas generally ranged from 1.50-3.25. An observation near Carlsbad (CA-SD-86) received total rainfall of 3.16, Encinitas (3962D) received 3.12, San Marcos (AS654) recorded a rainfall total of 2.88, and San Diego International Airport received 1.84 of rain.

Flash Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 00:00:00 to 21-AUG-23 00:00:00 (PST-8)
Location: SALVIA
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Union Pacific rail tracks were undercut and washed out when the Whitewater River broke a division bern at the California and Colorado River Aqueduct. At least one train was confirmed to have derailed, with two other trains either observed off track after being forced off the rails by floodwaters, or buried on track. Water and debris was estimated to be 10-15 feet high, and also buckled/cracked the bridge footing at Whitewater. This also severed fiber cables in the area, leading to outages.

Debris Flow in SAN BERNARDINO, CALIFORNIA
From 20-AUG-23 12:00:00 to 20-AUG-23 13:00:00 (PST-8)
Location: GLEN MARTIN
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported debris flows in the Forest Falls and Angelus Oaks areas with rock debris in all lanes. The largest debris flow was estimated to be around 100 yards wide and 6 feet deep.

Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 06:00:00 to 20-AUG-23 12:00:00 (PST-8)
Location: LA QUINTA
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy rainfall from Tropical Storm Hilary lead to flooding waters several feet deep at the La Quinta Resort and Club.

Flood in SAN BERNARDINO, CALIFORNIA
From 20-AUG-23 12:00:00 to 20-AUG-23 19:00:00 (PST-8)
Location: VICTORVILLE
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Several streets near Doris Davies Park in Victorville were closed due to flooding.

Flood in SAN BERNARDINO, CALIFORNIA
From 20-AUG-23 12:00:00 to 20-AUG-23 19:00:00 (PST-8)
Location: THORN
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Reports of street flooding on Park Avenue in Victorville.

Flash Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 00:00:00 to 21-AUG-23 06:00:00 (PST-8)
Location: THOUSAND PALMS
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A roughly 30-mile stretch of I-10 between Bob Hope Drive and Indian Canyon Drive was closed due to inundation by mud, debris, and flooding. Flooding covered Gene Autry Road in Palm Springs.

Flash Flood in RIVERSIDE, CALIFORNIA
From 20-AUG-23 00:00:00 to 21-AUG-23 00:00:00 (PST-8)
Location: BANNING
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Mias Canyon Bridge near the Apple Burn Scar was washed out due to heavy rain and flowing debris.