A strong mid-level trough protruded into the Desert Southwest, which led to strong Santa Ana winds and very dry weather conditions. This led to destructive wildfires and damaging winds across Southern California starting December 2nd and beyond.

Wildfire in SANTA ANA MOUNTAINS AND FOOTHILLS, CALIFORNIA
From 02-DEC-20 22:14:00 to 10-DEC-20 18:59:00 (PST-8)
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Cal Fire reports the start of the Bond Fire from a house fire on the night of December 2nd. Gusty Santa Ana winds aided in the scorching of 6,686 acres in the Santa Ana foothills near Santiago and Silverado Canyons. The area experienced multiple evacuation warnings and road closures, 21 structures damaged and 31 structures destroyed, along with 2 firefighter injuries.

High Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 02-DEC-20 19:00:00 to 03-DEC-20 13:00:00 (PST-8)
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Gusty Santa Ana winds occurred near and below the Cajon Pass generally 50-60 MPH. Marshall Peak observation hit 80 MPH around 12:45 AM on the 3rd.

High Wind in SANTA ANA MOUNTAINS AND FOOTHILLS, CALIFORNIA
From 02-DEC-20 19:00:00 to 03-DEC-20 13:00:00 (PST-8)
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Gusty Santa Ana winds occurred in the region with the Chino Hills RAWS hitting 79 MPH early morning on the 3rd. Most gusts in the region peaked around 50-60 MPH.

High Wind in SAN GORGONIO PASS NEAR BANNING, CALIFORNIA
From 02-DEC-20 17:00:00 to 03-DEC-20 13:00:00 (PST-8)
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Gusty Santa Ana winds swept through the region with the highest gust occurring at the Highland Springs RAWS at 76 MPH.

High Wind in RIVERSIDE COUNTY MOUNTAINS, CALIFORNIA
From 02-DEC-20 19:00:00 to 03-DEC-20 13:00:00 (PST-8)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Gusty Santa Ana winds occurred in this region, where SoCal Edison site Apple Canyon measures peak gust of 65 MPH.

High Wind in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 02-DEC-20 19:00:00 to 03-DEC-20 13:00:00 (PST-8)
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Gusty Santa Ana winds occurred across the valleys with Rockwood peaking at 66 MPH and Black Mountain Ranch peaking at 56 MPH.

Wildfire in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 01-DEC-20 17:00:00 to 12-DEC-20 07:30:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Cal Fire reports 1,087 acre fire near Butterfield Drive and Aviation Drive near the Corona Airport from the 1st until the 12th. The fire prompted closures of Route 71 and the airport, along with evacuation of homes in the region.

Wildfire in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 02-DEC-20 22:00:00 to 03-DEC-20 18:35:00 (PST-8)
Property damage: 1.00M
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Local fire authorities responded to the 30 acre vegetation fire, known as the Willow fire, on the evening of the 2nd. The fire began near 10 pm and may have started from a structure near Willow Glen Drive and Hillsdale Road in Rancho San Diego. 1 home was destroyed and 6 damaged. Wind gusts to 20 mph occurred late Wednesday evening with humidity values in the teens.

Wildfire in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 03-DEC-20 02:00:00 to 04-DEC-20 18:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

CalFire reports 300 acre Cerritos on the western side of Hemet near the 23900 block of California avenue. Wind gusts 25 to 30 mph at time of start and prompted evacuation orders and warnings.

High Wind in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 02-DEC-20 19:00:00 to 03-DEC-20 13:00:00 (PST-8)
Magnitude: 83.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong Santa Ana winds occurred across the region with a peak gust of 95 MPH at Big Black Mountain site.