A closed upper low from the Pacific Northwest dropped south into Southern California, bringing gusty north to northeast winds, rain, and mountain snow February 9-11. Peak wind gusts of 60-70 mph were observed in the wind prone passes and canyons on February 10th and 11th. Many impacts occurred with these winds, including many overturned tractor trailers, trees downed, and flights diverted due to strong surface winds and wind shear. Rainfall totals ranged from a few tenths of an inch at the coast to up to 1 inch along the coastal slopes of the mountains. Up to 8 inches of snow fell in the San Bernardino Mountains, and up to 7 inches fell in the San Diego County mountains.

Strong Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 10-FEB-20 05:00:00 to 10-FEB-20 12:00:00 (PST-8)
Magnitude: 43.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Department of Highways

CalTrans reported a 2 ton semi truck overturned along the westbound I-210 and southbound I-15 connector. Road was closed through 1130 PST.

High Wind in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 10-FEB-20 04:00:00 to 10-FEB-20 07:00:00 (PST-8)
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

CalTrans reported a 100 foot tree down in Snow Valley due to high winds. This closed down Highway 18 near Snow Valley.

High Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 10-FEB-20 09:00:00 to 10-FEB-20 12:00:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

A semi-truck was overturned in northbound I-15 in Fontana due to strong winds.

High Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 10-FEB-20 01:00:00 to 10-FEB-20 02:00:00 (PST-8)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Deer Canyon reported a peak wind gust of 56 knots between 0100 and 0200 PST on February 10th.

High Wind in SANTA ANA MOUNTAINS AND FOOTHILLS, CALIFORNIA
From 10-FEB-20 04:00:00 to 10-FEB-20 05:00:00 (PST-8)
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Fremont Canyon reported a peak wind gust of 50 knots between 0400 and 0500 PST on February 10th.

High Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 10-FEB-20 06:00:00 to 10-FEB-20 07:00:00 (PST-8)
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

CSU San Bernardino reported a peak wind gust of 61 knots between 0600 and 0700 PST on February 10th.

Strong Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 11-FEB-20 02:00:00 to 11-FEB-20 04:00:00 (PST-8)
Magnitude: 47.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Department of Highways

Multiple trees fell onto a car and a house, damaging them, in Yucaipa around 0200 PST on February 11th. Peak wind gusts were around 54 mph at the time.

Strong Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 11-FEB-20 06:00:00 to 11-FEB-20 07:00:00 (PST-8)
Magnitude: 40.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Department of Highways

Six semi-trucks were overturned near Ontario on the I-15 and I-10 connector. This closed down northbound I-15 at the connector.

High Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 11-FEB-20 06:00:00 to 11-FEB-20 07:00:00 (PST-8)
Magnitude: 51.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Several trucks were overturned in Fontana on I-15 around 0630 PST. Peak wind gusts at the time were around 59 mph.

High Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 11-FEB-20 05:00:00 to 11-FEB-20 10:00:00 (PST-8)
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Peak wind gust at Ontario International Airport was 57 knots. Two commercial and one cargo flight were diverted to Los Angeles International Airport due to high winds.

High Wind in RIVERSIDE COUNTY MOUNTAINS, CALIFORNIA
From 11-FEB-20 04:00:00 to 11-FEB-20 05:00:00 (PST-8)
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Keen Ridge reported a peak wind gust of 54 knots between 0400 and 0500 PST on February 11th.

High Wind in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 11-FEB-20 06:00:00 to 11-FEB-20 07:00:00 (PST-8)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Lytle Creek reported a peak wind gust of 56 knots between 0600 and 0700 PST on February 11th.

High Wind in SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE, CALIFORNIA
From 11-FEB-20 06:00:00 to 11-FEB-20 07:00:00 (PST-8)
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Moreno Valley reported a peak wind gust of 58 knots between 0600 and 0700 PST on February 11th.

High Wind in SAN DIEGO COUNTY VALLEYS, CALIFORNIA
From 11-FEB-20 06:00:00 to 11-FEB-20 07:00:00 (PST-8)
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Case Springs reported a peak wind gust of 59 knots between 0600 and 0700 PST on February 11th.

High Wind in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 11-FEB-20 06:00:00 to 11-FEB-20 07:00:00 (PST-8)
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mt Laguna reported a peak wind gust of 50 knots between 0600 and 0700 PST on February 11th.

High Wind in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 11-FEB-20 08:00:00 to 11-FEB-20 09:00:00 (PST-8)
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Devil Canyon reported a peak wind gust of 60 knots between 0800 and 0900 PST on February 11th.

Heavy Snow in SAN BERNARDINO COUNTY MOUNTAINS, CALIFORNIA
From 09-FEB-20 08:00:00 to 11-FEB-20 11:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotters reported up to 8 inches of snow in Big Bear and up to 6 inches at Mountain High. A few inches of snow fell in Snow Valley, as well as Fawnskin.