A cold low from western Canada brought wintry storm conditions to the mountains, as well as hail and funnel clouds to the foothills and Central Valley. Additional rain also caused mudslides in already saturated mountain locations.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS STO wrote it up.
A cold low from western Canada brought wintry storm conditions to the mountains, as well as hail and funnel clouds to the foothills and Central Valley. Additional rain also caused mudslides in already saturated mountain locations.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Sacramento, CA wrote its last area forecast discussion before the first event at Jun 8, 8:41 AM PST, 5 hours 19 minutes earlier.
Area Forecast Discussion National Weather Service Sacramento CA 941 AM PDT Thu Jun 8 2017 .SYNOPSIS... Light rain across the region today, with a few mountain showers lingering into Friday. Cooler system this weekend may bring showers, thunderstorms, and light mountain snow. Dry and warmer next week. && .Discussion... A weak frontal system is now pushing through Northern California, bringing light precipitation across much of the region. Locally up to about two-thirds of an inch has been reported in the Valley, though most locations have received a couple of tenths of an inch. There are signs via satellite imagery that this system has begun to lose its moisture tap, which would suggest that precipitation will be tapering off soon, probably around midday or in the afternoon. This system has very little cold air moving in, and so potential for stronger convection this afternoon is low. A few showers may linger over the mountains into Friday, but most of the forecast area should remain dry. Dry weather should continue into early Saturday. A closed upper low then begins to approach Northern California Saturday, then move through the region on Sunday. Precipitation may not be as widespread with the weekend weather system, but given its convective nature, local areas could see some good downpours. With a colder airmass moving into place, the mountains could see light snow accumulations down to 5000 feet. Thunderstorms will also be possible on Sunday. Dang && .EXTENDED DISCUSSION (Monday THROUGH Thursday) Cyclonic flow begins to weaken on Mon as the upper low moves from SErn ORE/NRN NV into ID allowing precip to end over Norcal. As the upper low moves into the Nrn Plains and Srn Canada the flow aloft transitions to Wly as 5H heights rise over the area. This will allow warmer air to advect into the area and temps will be trending upward through the period, after a very cool start. Mon's max temps will some 5-10 degrees below normal, moderating closer to normal Tue/Wed, and then rapidly warming late in the week. By next Thu/Fri, 850 mbs temps forecast in the low to mid 20s degrees C suggest that max temps in the Valley will be in the 90s to low 100s and 70s and 80s in the mountains. Lowering humidities and drying katabatic winds will accompany the warming trend. JHM && && .AVIATION... Frontal precip band moves across Norcal today with CIGS/VSBYS lowering to MVFR over RDD/RBL after 12z Thu, and IFR/LIFR over Sierra, and possibly MVFR CIGS over Srn Sac Vly after 00z Fri. Conditions improving to VFR over Sac Vly after 12z-15z Fri, but lower conditions persist over Sierra. Gusty winds to 30 kts over Nrn Sac Vly decreasing to 20 kts aft 18z Thu. Breezy conditions continuing over higher terrain. && && .STO WATCHES/WARNINGS/ADVISORIES... None. &&
The Sacramento radar (KDAX), 115 km away, was scanning. The volume nearest the first event began at 22:01 UTC.
1 debris flow, 1 funnel cloud, 1 hail, 1 winter weather. Local standard time, as filed.
Heavy rain on already saturated ground brought down debris onto the westbound lane of Highway 50 at Alder Creek, a rural location between White Hall and Kyburz. The westbound lane of Highway 50 was blocked for about 2 days before the debris was cleared by Caltrans.
A funnel cloud was observed by a spotter from the town of Olivehurst, visible over the Plumas Lake area. Multiple members of the public also reported seeing a funnel cloud in the area. Video footage seen on social media suggests the funnel cloud at least came close to touching down in a heavily forested area, but no damage was reported.
Large amounts of small hail were reported covering the ground like snow in Georgetown. Photos on Twitter also showed hail completely covering the ground at nearby Garden Valley. This hail created very slippery driving conditions on area roads.
There was a 24 hour total of 6 of snow reported by Caltrans at Donner Pass, 5 at Kingvale. There was 4 of snow reported at Squaw Valley Ski Resort. This late season snow event brought chain controls and travel slow downs over the Sierra passes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2017Every state in 2017This day in weather historyWarnings in California, June 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 706968, 700059, 700061, 700605.