A cold storm brought blizzard conditions in the mountains and severe thunderstorms with weak tornadoes, hail, flooding in the Central Valley. There was very heavy mountain snow, especially in the Sierra, with storm total snow accumulations to 6 to 8 feet. The heavy snow coupled with strong winds brought whiteout conditions and shut down major mountain roads such as I80. Snow accumulations with this cold storm extended down through the foothills, causing tens of thousands of homes to lose power and many schools to close.

Tornado in COLUSA, CALIFORNIA
From 02-FEB-19 15:38:00 to 02-FEB-19 15:43:00 (PST-8)
Location: STEGEMAN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

On February 2, 2019 there was a brief tornado touchdown at the Sacramento River National Wildlife Refuge north of Colusa. A weather spotter took a video of the touchdown, which occurred in a wetlands area. No damage was reported.

Tornado in SUTTER, CALIFORNIA
From 02-FEB-19 17:50:00 to 02-FEB-19 17:55:00 (PST-8)
Location: YUBA CITY SOUTH
Tornado F-scale: EF0
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

National Weather Service meteorologists confirmed an EF0 tornado touched down at approximately 5:50 pm pst on Saturday, February 2nd, just south of Yuba City, CA. This tornado touch down was very brief as it tracked to the north northwest. Radar data and the damage pattern were used to confirm the touchdown. Several trees were knocked down and there was minor roof damage to a home. Leaves and branches were completely stripped off one side of a tree.

Hail in COLUSA, CALIFORNIA
From 02-FEB-19 15:45:00 to 02-FEB-19 16:00:00 (PST-8)
Location: COLUSA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Half dollar hail reported north of Colusa.

Funnel Cloud in COLUSA, CALIFORNIA
From 02-FEB-19 16:30:00 to 02-FEB-19 16:35:00 (PST-8)
Location: STEGEMAN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a well defined wall cloud with a funnel cloud north of Colusa.

Flood in TUOLUMNE, CALIFORNIA
From 02-FEB-19 17:00:00 to 02-FEB-19 17:00:00 (PST-8)
Location: CHINESE CAMP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tuolumne County Sheriffs Office reports there are road closures along Red Hills Road in Chinese Camp, Sims Road in Jamestown, and Bell Mooney Road in Jamestown.

Thunderstorm Wind in SUTTER, CALIFORNIA
From 02-FEB-19 17:00:00 to 02-FEB-19 17:30:00 (PST-8)
Location: YUBA CITY SOUTH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind caused tree and fence damage near Carlson Road and Hutchinson Road in Yuba City.

Flood in BUTTE, CALIFORNIA
From 04-FEB-19 02:00:00 to 04-FEB-19 10:00:00 (PST-8)
Location: ANITA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A social media user reported flooding on Highway 99, north of Chico. Cars were seen driving through water.

Flood in GLENN, CALIFORNIA
From 04-FEB-19 10:00:00 to 04-FEB-19 11:28:00 (PST-8)
Location: WILLOWS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Caltrans District 3 reported that flooding has closed Highway 162 between 1st Street and County Rd P east of Willows in Glenn County.

Flood in GLENN, CALIFORNIA
From 04-FEB-19 10:00:00 to 04-FEB-19 12:20:00 (PST-8)
Location: WILLOWS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Caltrans reported a flooded roadway in northern Willows.

Heavy Snow in MT SHASTA/WESTERN PLUMAS COUNTY, CALIFORNIA
From 02-FEB-19 07:00:00 to 05-FEB-19 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Accumulating snow fell, causing slippery mountain roads. A COOP observer in Chester reported 5 inches of snowfall in 24 hours and a storm total of 15 inches (elevation 4530 feet). Quincy reported a storm total of 10.

Heavy Snow in MOTHERLODE/CAMPTONVILLE TO GROVELAND, CALIFORNIA
From 04-FEB-19 04:00:00 to 05-FEB-19 08:00:00 (PST-8)
Property damage: 1.00M
Crop damage: 0.00K
Reported by: CoCoRaHS

Accumulating heavy, wet snow fell into the Motherlode foothills, causing major winter weather impacts. The biggest impacts were south of Highway 50. A CoCoRaHS observer at Tuolumne City reporting 7 inches of snow, unusual for the area. The heavy snow brought down many hundreds of trees & limbs, blocking roads at times and bringing down numerous power lines. Nearly 40,000 PG&E customers were reported without power in Tuolumne and Calaveras counties. Some power outages lasted several days before crews could reach and repair the lines. More than 40 schools closed down in Tuolumne and Calaveras counties, as well as most county offices and many businesses. Even snow plows got stuck on Highway 49 due to the heavy snow. Snow reached down to to as low as 750 feet elevation briefly. A CoCoRaHS observer 2.5 miles E of Shingletown had 7 of snow, a spotter reported 6.25 inches of snow in Placerville (elevation 2250 feet), and the Grass Valley COOP reported 2.4.

Heavy Snow in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 02-FEB-19 08:00:00 to 05-FEB-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Very heavy snow fell, bringing whiteout conditions and extremely slippery conditions. I-80 was shut down for 24 hours, from 9 am on Monday the 4th to 9 am on Tuesday the 5th, causing major travel and commerce disruptions.
Here are some of the higher reported storm totals: 92 at Castle Peak (Donner Pass), 92 at Kirkwood Ski Resort, 84 at Squaw Valley Ski Resort, 83 at Bear Valley Ski Resort, and 80 at Sugar Bowl Ski Resort.

Heavy Snow in BURNEY BASIN/EASTERN SHASTA COUNTY, CALIFORNIA
From 02-FEB-19 07:00:00 to 05-FEB-19 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Accumulating snow fell, causing slippery mountain roads. A spotter reported 8 inches of snow in Fall River Mills (elevation 3300 feet).

Heavy Snow in NORTHEAST FOOTHILLS/SACRAMENTO VALLEY, CALIFORNIA
From 04-FEB-19 04:00:00 to 05-FEB-19 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Accumulating snow fell into the northeast foothills, with a CoCoRaHS observer 2.5 miles east of Shingletown reporting 6.4 inches of new snow in 24 hours. This caused travel significant delays on area roads.