Thunderstorms developed behind a cold front bringing large hail and large amounts of small hail.
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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.
Thunderstorms developed behind a cold front bringing large hail and large amounts of small hail.
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 Oct 2, 7:42 AM PST, 6 hours 18 minutes earlier.
Area Forecast Discussion National Weather Service Sacramento CA 842 AM PDT SUN OCT 2 2016 .SYNOPSIS... A weather system with unseasonably cool temperatures, and periods of Valley rain, mountain snow, and possible thunderstorms continues into early Tuesday. Drier weather expected by the middle of this week. && .DISCUSSION... Clear skies continue over much of the area, but this will change quickly as a narrow frontal band located behind a line from around Red Bluff to Clear Lake pushes to the southeast. Some rain has been falling from this band, with around a half inch along the coast to around 0.05-0.10" over the eastern side of the Coastal Range in western Shasta and Tehama counties so far this morning. This will gradually spread through much of the area, though high resolution models suggest that it will weaken as it moves to the southeast. Much of the precipitation will be north of I80, especially with the initial frontal band. A concern this afternoon is for thunderstorms to develop in the clearing skies behind the front, with a brief lull in the precipitation. Solar heating timed with the cold core aloft could be enough to generate some thunderstorms over the Valley and into the foothills. The best potential looks north of I80, though some models hint that an isolated thunderstorm could reach as far south as Stockton/Modesto. While modeled shear in the lowest levels is fairly marginal, there is ample shear higher up. Will be watching closely to see if conditions to develop for severe weather, though expect it would be rather isolated. A Winter Weather Advisory takes effect after 11 am, due to the potential for some early season snow. This could begin in the late morning for the Lassen Park/western Plumas County area, then arriving in the Sierra in the early afternoon. EK && .EXTENDED DISCUSSION (Thursday THROUGH Sunday) Dry through the extended period under upper level high pressure. Temperatures will be warming through the extended period reaching just a little below normal by Sunday. Breezy northerly winds will be decreasing on Thursday as pressure gradients relax. A weather system passing to the north early Saturday will turn winds to more westerly but otherwise have little impact on CWA weather with any precipitation remaining north of the forecast area. && .AVIATION... VFR conditions early this morning. A weak frontal band dropping through Norcal will bring scattered light showers starting northern Sacramento valley and shifting southward. Possible MVFR at times developing shortly over the northern Sacramento valley...after 19z southern Sacramento valley and after 20z northern San Joaquin county. Isolated thunderstorms also possible. Improving conditions tonight. Breezy west winds with gusts to 30 mph through the delta and over the Sierra crest. && .STO Watches/Warnings/Advisories... Winter Weather Advisory until 5 AM PDT Monday for West Slope Northern Sierra Nevada-Western Plumas County/Lassen Park. &&
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 117 PM PDT SUN OCT 2 2016 CAZ016-017-022115- CENTRAL SACRAMENTO VALLEY CA-SOUTHERN SACRAMENTO VALLEY CA- 117 PM PDT SUN OCT 2 2016 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN YUBA...SOUTHEASTERN SUTTER AND NORTHEASTERN YOLO COUNTIES UNTIL 215 PM PDT... AT 115 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER ROBBINS...OR 14 MILES NORTH OF WOODLAND...MOVING EAST AT 15 MPH. DIME SIZE HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... PLEASANT GROVE...NICOLAUS AND ROBBINS. PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 3886 12174 3895 12175 3904 12146 3874 12149 TIME...MOT...LOC 2015Z 266DEG 12KT 3888 12173 EK
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 150 PM PDT SUN OCT 2 2016 CAZ015-022145- NORTHERN SACRAMENTO VALLEY CA- 150 PM PDT SUN OCT 2 2016 ...SPECIAL WEATHER STATEMENT... AT 150 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR OLINDA...OR 14 MILES SOUTHWEST OF REDDING...MOVING EAST AT 10 MPH. WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... REDDING...ANDERSON...OLINDA AND COTTONWOOD. PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 4037 12261 4043 12262 4050 12224 4023 12231 TIME...MOT...LOC 2050Z 281DEG 10KT 4040 12252 EK
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 252 PM PDT SUN OCT 2 2016 CAZ017-067-022230- MOTHERLODE CA-SOUTHERN SACRAMENTO VALLEY CA- 252 PM PDT SUN OCT 2 2016 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN PLACER...WEST CENTRAL EL DORADO AND NORTHEASTERN SACRAMENTO COUNTIES UNTIL 330 PM PDT... AT 251 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER ROSEVILLE...MOVING SOUTHEAST AT 15 MPH. DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... ROSEVILLE...CITRUS HEIGHTS...FOLSOM...ROCKLIN...FAIR OAKS...EL DORADO HILLS...CAMERON PARK...LOOMIS...GRANITE BAY...ORANGEVALE...NATOMAS... ANTELOPE...GOLD RIVER...FOOTHILL FARMS AND CLARKSVILLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO STATIONS AND AVAILABLE TELEVISION STATIONS FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. && LAT...LON 3872 12139 3884 12133 3879 12098 3856 12110 TIME...MOT...LOC 2151Z 295DEG 14KT 3876 12130 WILSON
The Sacramento radar (KDAX), 46 km away, was scanning. The volume nearest the first event began at 21:59 UTC.
2 hail. Local standard time, as filed.
Hail up to 1.25 inches in diamter was reported at the Fountains shopping complex in Roseville. Tree leaves and branches were reported down.
Hail up to 1 inch in diameter was reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2016Every state in 2016This day in weather historyWarnings in California, October 2016
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 2026-10-01. Each event’s entry at NCEI: 664161, 664162.