A weak upper level trough situated in northern Nevada moved slowly into Southwest Idaho ad Southeast Oregon kicking off isolated severe thunderstorms across the area.
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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.
A weak upper level trough situated in northern Nevada moved slowly into Southwest Idaho ad Southeast Oregon kicking off isolated severe thunderstorms across the area.
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 8, 7:46 PM MST, 3 hours 14 minutes earlier.
Area Forecast Discussion National Weather Service Boise ID 846 PM MDT Sat Jul 8 2017 .DISCUSSION...Isolated thunderstorms formed a bit further west over Harney County Oregon than in previous forecast. Already updated forecasts to cover these. Models have backed off a bit on convection continuing past midnight, but the activity over Nevada still shows some organization that might keep it going into southern Idaho past midnight. Current forecast has some indication of the potential past midnight, so will make no changes there. High resolution models continue to indicate a bit stronger southerly winds across the higher elevations near the Nevada border tonight, as outflow from the Nevada storms continues to move north, so we increased winds south of the Snake River Plain overnight. Otherwise, cloud cover overnight will likely keep low temperatures up, and temperatures tomorrow should only be a degree or two cooler than today, so continuing the Heat Advisory looks good. && .AVIATION...VFR with isolated thunderstorms ending by 05Z across the Southern Highlands through the Magic Valley in Idaho and in southern Harney and Malheur Counties in Oregon. Gusts to 50 kts possible in conjunction with thunderstorms. Otherwise, surface winds will be variable, 10 kts or less. Winds aloft to 10KFT MSL: south to southwest 10-20 kts. && .PREV DISCUSSION... SHORT TERM...Tonight through Tuesday. We have extended the heat advisory for the Treasure Valley through Sunday, as Sunday will be only a degree or two cooler than today, not enough to provide relief. But Monday will be another 5 to 8 degrees cooler which will be noticeable. We are tracking the northward progress of a weak disturbance in southern Nevada. Models develop isolated thunderstorms south of the Snake Basin late today and tonight, and in all Idaho mountain zones Sunday afternoon and Sunday night. Storms will bring gusty winds 40 to 50 mph but little if any rain. Monday will bring clearing and cooling from the west as a Pacific trough comes inland. Tuesday should be sunny with normal temperatures for a change as the trough passes through. LONG TERM...Tuesday night through Saturday. Through the mid and long term, the area is expected to be under a southwest flow, with an upper high near the Four Corners region and an upper low off the coast of British Columbia. This will keep temperatures above normal. Both the GFS and ECMWF are showing some indication of monsoon moisture returning to the area, but for now, the flow looks to favor thunderstorms only in the terrain of Idaho, mainly along the ID/NV border. In addition, as the high continues to intensify toward the weekend, valley highs could return to 100-105F. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...Heat Advisory until 9 PM MDT Sunday IDZ012-014. OR...Heat Advisory until 9 PM MDT Sunday ORZ064. && www.weather.gov/Boise www.facebook.com/NWSBoise www.twitter.com/NWSBoise DISCUSSION...TB AVIATION.....AB PREV SHORT TERM...LC PREV LONG TERM....EP
The Boise radar (KCBX), 80 km away, was scanning. The volume nearest the first event began at 05:59 UTC.
1 thunderstorm wind. Local standard time, as filed.
A post on Facebook reported that a 25 feet tall Russian olive tree was downed by thunderstorm outflow winds. The tree had a 2 part trunk with the larger being about 34 inches in diameter.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2017Every state in 2017This day in weather historyWarnings in Oregon, 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: 707839.