A series of cold, upper level ldisturbances tracked across northern California from September 16-18. This brought showers, thunderstorms, and high elevation snow to the region. Flooding and wind damage were the main impacts from this storm.

Winter Weather in WEST SLOPE NORTHERN SIERRA NEVADA, CALIFORNIA
From 16-SEP-19 04:44:00 to 16-SEP-19 04:44:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The Squaw Alpine Ski Resort tweeted a picture of snow covering the ground on their high Camp Slope. Estimated snow depth from picture would be 1 to 2 inches.

Funnel Cloud in YUBA, CALIFORNIA
From 16-SEP-19 11:27:00 to 16-SEP-19 11:32:00 (PST-8)
Location: LOMA RICA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public saw and photographed a small funnel cloud near Loma Rica. No contact with the ground was observed.

Thunderstorm Wind in YUBA, CALIFORNIA
From 16-SEP-19 11:50:00 to 16-SEP-19 11:50:00 (PST-8)
Location: MARYSVILLE
Magnitude: 43.00 EG
Crop damage: 2500.00K
Reported by: Public

A walnut tree was snapped 3 miles north of Marysville on highway 70. Time stamp of wind gust damage is estimated based on radar.

Flood in TEHAMA, CALIFORNIA
From 18-SEP-19 14:45:00 to 18-SEP-19 15:00:00 (PST-8)
Location: RICHFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The California Highway Patrol reported that there was flooding on the bridge between Gyle and Finnel roads and that vehicles were sliding around because of it.

Heavy Rain in NEVADA, CALIFORNIA
From 18-SEP-19 19:47:00 to 18-SEP-19 20:47:00 (PST-8)
Location: NEVADA CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported mud and rocks in the roadway on highway 49 between Nevada City on the South Yuba River. Time is estimated by radar.

Flood in NEVADA, CALIFORNIA
From 18-SEP-19 20:30:00 to 18-SEP-19 20:30:00 (PST-8)
Location: NEVADA CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

The local news paper reported that multiple members of the public were sending in reports of localized street flooding in Nevada City. This particular point does not necessarily reflect the exact location of flooding and the time of this report is based on  radar and observations.

Thunderstorm Wind in BUTTE, CALIFORNIA
From 18-SEP-19 17:00:00 to 18-SEP-19 17:00:00 (PST-8)
Location: OROVILLE
Magnitude: 43.00 MG
Property damage: 4000.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The media shared a wind damage report from the public which included images and videos. A hay barn and horse stable had pole and roof damage that can clearly be seen in the footage. The RAWS weather station at OpenShaw, which is close to the damage site, reported a 50 mph wind gust.

Debris Flow in BUTTE, CALIFORNIA
From 18-SEP-19 18:00:00 to 18-SEP-19 19:00:00 (PST-8)
Location: BIG BEND
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Minor debris and rock slides blocked highway 70 from Jarbo Gap to Greenville Way (Junction of state route 70 and state route 89). Road culverts were blocked with debris requiring lane closures. The debris flow is associated with the Camp Fire burn area.