Monsoon moisture streamed northward across southern Idaho and with the combination of daytime heating and a weak upper trough moving through the region, isolated severe thunderstorms developed over the Magic Valley in the late afternoon.
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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 BOI wrote it up.
Monsoon moisture streamed northward across southern Idaho and with the combination of daytime heating and a weak upper trough moving through the region, isolated severe thunderstorms developed over the Magic Valley in the late afternoon.
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 Boise, ID wrote its last area forecast discussion before the first event at Jul 15, 1:53 PM MST, 1 hour 22 minutes earlier.
Area Forecast Discussion National Weather Service Boise ID 253 PM MDT Sat Jul 15 2017 .SHORT TERM...Tonight through Monday...Monsoon moisture over Idaho this evening will get pushed east of the area overnight as a weak short wave passes through, ushering in cooler and drier westerly flow. Gusty northwest winds this evening near Ontario and Baker City, as the cooler/drier airmass moves in. Still enough instability this evening to support scattered thunderstorms mainly over the Magic Valley and West Central Idaho Mountains, but should be mostly east of the area by midnight. Enough moisture left in far southern Twin Falls county on Sunday for a chance of an afternoon thunderstorm, but elsewhere it should be sunny and dry through Monday. Temperatures should be about 10 degrees cooler on Sunday and Monday, back to near normal in most areas. .LONG TERM...Monday night through Saturday...Dry with slightly above-normal temperatures with southwest flow aloft. Monsoon moisture will remain to the south and east of our CWA, although it will come close enough to southeast Twin Falls County Thu to warrant a slight chance of thunder mention. && .AVIATION...VFR. Showers and storms will move out of SE Oregon by 16/00Z, while continuing in SW Idaho into the evening. Strongest cells are expected near KTWF/KJER and east of KMYL. Storms will exit the area completely by 16/04Z. Showers will reform near KTWF/KJER after 16/09Z and continue through 16/18Z. Surface winds NW 5-15 kts through Sunday. Winds aloft through 10k ft MSL, SW through NW up to 20 kts. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...Red Flag Warning until midnight MDT tonight IDZ423-424-426. OR...None && www.weather.gov/Boise www.facebook.com/NWSBoise www.twitter.com/NWSBoise SHORT TERM...TB LONG TERM....SP/SP AVIATION.....SP
The Pocatello radar (KSFX), 184 km away, was scanning. The volume nearest the first event began at 22:16 UTC.
2 thunderstorm wind. Local standard time, as filed.
The local newspaper and a trained spotter reported large pine trees down and a large section of a motel roof was peeled off.
The Jerome Butte ITD station reported a wind gust of 64 MPH.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2017Every state in 2017This day in weather historyWarnings in Idaho, July 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: 707848, 707850.