As Summer began winding down, a strong trough pushed a cold front through southeast Oregon and southwest Idaho. The timing coincided with peak instability, allowing thunderstorms to form as the front passed.
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The episode as NWS BOI wrote it up.
As Summer began winding down, a strong trough pushed a cold front through southeast Oregon and southwest Idaho. The timing coincided with peak instability, allowing thunderstorms to form as the front passed. These storms exhibited locally heavy rainfall, but even more significant local wind gusts observed in southeast Oregon.
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 Sep 28, 1:23 PM MST, 5 hours 39 minutes earlier.
Area Forecast Discussion National Weather Service Boise ID 223 PM MDT Sun Sep 28 2025 .SHORT TERM...Tonight through Tuesday night...Showers and thunderstorms already underway along the ID/NV border east of Owyhee and will continue through sunset. The main Pacific frontal band is now forecast to reach eastern Oregon Monday afternoon and western Idaho Monday evening through Tuesday morning. This later timing will allow our CWA to be several degrees warmer Monday than previously forecast, especially in Idaho. Latest models continue to slowly decrease total rainfall Monday through Wednesday, now only .50 to .80 inch in the Idaho mountains north of the Snake Basin, .30 to .50 inch in the Idaho valleys, and .20 to.40 inch in eastern Oregon, much less than forecast several days ago. A 20-30 percent chance of thunderstorms with local heavy rain is still forecast as the front is passing, with the greater chances in southern areas, and more likely in Idaho than in Oregon. Temperatures will lower about 10 degrees Tuesday from Monday, with similar temps on Wednesday. Winds should only be 10 to 20 mph as the front passes. Strongest gusts (near 40 mph) are expected in southern Harney County Tuesday afternoon. .LONG TERM...Wednesday through Sunday...Largely unsettled pattern is expected to continue through the end of the week from Wednesday to Friday, as a large upper low mostly lingers over the coast of British Columbia. Strong southwesterly flow from this low will steer Pacific moisture into the northwest region, sustaining isolated showers across most of the area until Friday. Toward the end of the week, the upper low is projected to break off and dig into the region as a longwave trough. Precipitation intensity is expected to gradually decrease through the week, with higher elevations generally seeing the greater amounts Thursday through Friday. The pattern is expected to bring a steady cooling trend through the week, dropping peak valley temperatures down from the lower 70s Wednesday into the mid to lower 60s Friday to Sunday. There is considerable guidance uncertainty on a second longwave trough expected to dig into the region Saturday and Sunday; the pattern can either slowly form a closed upper low off California or dig across the region as a longwave pattern. For now, next weekend will mainly see little or no precipitation and a strong cooling trend into the 50s/60s. && .AVIATION...VFR. Isolated showers/thunderstorms in south-central ID (Magic Valley) and eastern Oregon this afternoon/early evening. Thunderstorms capable of 30kt outflows. Surface winds: variable or SW-NW 5-10 kt through early afternoon. Winds aloft at 10kft MSL: S-SW 10-20 kt. KBOI...VFR with clear skies. Surface winds: N-NW up 5-10 kt this afternoon/early evening. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise SHORT TERM...LC LONG TERM....JY AVIATION.....JY
The Boise radar (KCBX), 135 km away, was scanning. The volume nearest the first event began at 02:02 UTC.
2 thunderstorm wind. Local standard time, as filed.
Rome airport observed gusts near 60 mph for about 5 minutes as a thunderstorms gust front move through. Sustained winds were between 36-44 mph at the same time. This occurred shortly before an even stronger gust occurred at Burns Junction.
A thunderstorm developed near Burns Junction shortly after the Rome storm, and produced even stronger wind. The mesonet near Burns Junction recorded gusts over 60 mph for about 10 minutes, with a peak gust of 71 mph. Sustained winds were still near 40 mph, speaking to the quick moving nature of the winds.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2025Every state in 2025This day in weather historyWarnings in Oregon, September 2025
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: 1296031, 1296032.