Moderate to strong Santa Ana winds surfaced west of the mountains as high pressure built over the Great Basin on the 9th. Surface pressure gradients favored the Inland Empire and Orange County for the strongest winds.
Every event with a place to put it; 4 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 SGX wrote it up.
Moderate to strong Santa Ana winds surfaced west of the mountains as high pressure built over the Great Basin on the 9th. Surface pressure gradients favored the Inland Empire and Orange County for the strongest winds. In most places peak wind gusts were 35-55 mph, but local gusts to 70 were reported. The downsloping flow sent relative humidity values crashing. The Canyon 2 Fire began near Anaheim Hills ultimately scorching more than 9,000 acres and damaging or destroying 80 structures. Isolated damage also occurred below the Cajon Pass.
The national radar mosaic for the moment the first event began.
2 high wind, 1 strong wind, 1 wildfire. Local standard time, as filed.
CHP reported a big rig that jackknifed and flipped, blocking all lanes of the 210 north of Fontana.
The mesonet station in Fremont Canyon reported a peak wind gust of 70 mph, sustained winds were 35-45 mph.
The Canyon 2 Fire began around 0900 PST on the 9th near the 91 Freeway and Gypsum Canyon Rd. in Anaheim Hills. The fire spread rapidly threatening numerous structures. In the first 24 hours the fire consumed more than 7,000 acres. In total 25 structures were destroyed, 55 were damaged and 9,217 acres burned. Four injuries were also reported. The cause of the fire was reported to be embers from the Canyon Fire which began September 25 and contained October 4th. Damage value is an estimate.
The USFS RAWS station at Highland Springs (below the San Gorgonio Pass) reported peak wind gusts in the 58 to 61 mph range for 2 hours. Sustained winds were 30-40 mph. Winds in the rest of the Inland Empire remained below High Wind Criteria with peak gusts of 35-55 mph.
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, October 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 2026-10-01. Each event’s entry at NCEI: 725349, 725347, 725310, 725348.