Severe thunderstorm outflow winds occurred in parts of extreme southeast Idaho.
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The episode as NWS PIH wrote it up.
Severe thunderstorm outflow winds occurred in parts of extreme southeast Idaho.
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 Pocatello, ID wrote its last area forecast discussion before the first event at Aug 13, 10:26 AM MST, 2 hours 4 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Pocatello ID 1126 AM MDT Wed Aug 13 2025 .KEY MESSAGES... - Today will mark the warmest day of the week, coinciding with critical fire weather conditions regionwide due to gusty winds, low relative humidity, and isolated thunderstorms. - Daily shower and thunderstorm chances will continue through the weekend, peaking in coverage each afternoon, with stronger showers and storms capable of producing gusty outflow winds. - Temperatures through early next week will remain near normal to above normal, with highs each day in the 80s/90s. && .SHORT TERM /THROUGH THURSDAY NIGHT/... Issued at 816 AM MDT Wed Aug 13 2025 Early morning satellite imagery shows a series of shortwave troughs in the Great Basin northeast into Idaho working up and over a broad ridge of high pressure over the SW CONUS. These shortwaves are out ahead of a more organized trough in the NE Pacific, which will shift this ridge of high pressure further east midweek. The first in this series of shortwaves will work overhead today, supporting an uptick in winds regionwide later today in addition to isolated showers and thunderstorms. We added isolated showers and storms this morning mainly along and east of I-15. Then boosted that potential in the afternoon across higher elevations OUTSIDE of the central mountains. The primary hazards with stronger showers and storms will center around gusty outflow winds given a very dry environment at the surface. Two main corridors for stronger storms are expected today, with the primary being in the South Hills east through the Southeast Highlands and another up along the Montana Divide and Eastern Highlands. This is where the HREF model probability of wind gusts greater than 35 mph shows a 50-70% chance, with a 10% chance of wind gusts greater than 58 mph around the South Hills. Areal coverage of showers/storms will peak this afternoon, with isolated coverage remaining overnight generally along and south of the Snake River into the Bear Lake area. Outside of any thunderstorms today, winds will peak synoptically this afternoon around 15-30 mph with gusts to 25-45 mph. Today is also shaping up to be the warmest day of the week, with highs in the valleys in the upper 80s to upper 90s, coming within a few degrees of daily record highs in places like Pocatello and Idaho Falls. Due to a combination of low relative humidity, gusty winds, and isolated thunderstorms, a Red Flag warning is in effect for all of central and eastern Idaho today. More on that in the Fire Weather discussion below. High temperatures will cool around 3-6 degrees for Thursday to the mid 80s to low 90s in the valleys behind a departing shortwave trough working east over the Continental Divide. A secondary shortwave moving overhead throughout the day Thursday will support another round of isolated showers in the morning, followed by isolated to scattered showers and thunderstorms in the afternoon and evening hours. Best chances will again remain confined to the Southern/Eastern Highlands, Upper Snake River Plain, and Montana Divide with more scattered coverage expected south of the Snake River. The primary hazard with any stronger showers or storms will continue to center around gusty outflow winds given a very dry environment at the surface. Winds will remain breezy outside of any thunderstorms, peaking Thursday afternoon around 10-25 mph with gusts to 20-40 mph. && .LONG TERM /FRIDAY THROUGH TUESDAY/... Issued at 235 AM MDT Wed Aug 13 2025 We return to a bit more active pattern (comparatively) in the extended forecast period due to a broad area of troughing over the West Coast and an approaching closed low that arrives off the coast of British Columbia late in the weekend. This will at least keep a series of shortwaves passing through Eastern Idaho to keep at least a mention of isolated to nearly scattered showers and thunderstorms in our area each afternoon through the weekend and into early next week though Sunday looks to be about the peak of the activity, or at least the day with the most widespread activity. This will help bring down our afternoon temperatures a few degrees, so look for highs in the upper 80s to low 90s in the lower elevations this weekend and and very slight warming trend early next week as we begin to get drier again as high pressure builds in over the Four Corners Region. Wind gusts through the weekend will be around 15 to 25 mph. && .AVIATION /18Z TAFS THROUGH 18Z THURSDAY/... Issued at 1120 AM MDT Wed Aug 13 2025 VFR conditions expected through the TAF period for all ports, but the weather is not completely quiet anymore. A shortwave trough will increase surface winds across the area and will develop isolated to scattered thunderstorms this afternoon/evening. Expecting most gusts to stay within the 20-30 kt range, but stronger showers and thunderstorms could develop a few that exceed 30 kts. Still only limiting the mention of showers and thunderstorms to DIJ and BYI this afternoon, but PIH and IDA could get in on activity, if given the right trajectory of individual cells. Included a PROB30 group for DIJ as they will see the best chances for thunderstorms through the afternoon/evening. Expecting winds and precipitation activity to wane in the late evening tonight. Should see a similar story play out again Thursday afternoon with the potential for additional temporary impacts in the afternoon. && .FIRE WEATHER... Issued at 816 AM MDT Wed Aug 13 2025 A RED FLAG WARNING will be in effect for all of our Fire Weather Zones today from noon to 10 PM due to a combination of isolated thunderstorms, low RHs, and gusty winds. Isolated thunderstorms won't be much of an issue for FWZ 422 and 425, but will be more prevalent in FWZ 411, 413, 427, 475, and 476 where storms fire up this afternoon off of the terrain. We have a few in Zone 410 this morning north of Idaho Falls and will again this afternoon. Wind gusts for most today will range from 25 to 35 mph. However, the NBM is showing about a 40 to 60 percent chance of wind gusts exceeding 40 mph out across the Arco Desert/INL area and westward towards Carey. Wind gusts with any isolated thunderstorms have the potential to be quite gusty with the HREF showing max gusts of 50 to 60 mph with the strongest storms. This change in our weather pattern comes as a trough moves onto the West Coast and is able to push the area of high pressure that's been over the Southwestern US just a bit farther eastward. Several embedded shortwaves will pass through this trough over the next few days, which will keep around at least some isolated if not nearly scattered thunderstorm chances each afternoon. Storms on Thursday look to be a bit more limited to within the South Hills and Eastern Highlands, but could produce some 50 to 60 mph gusts once again. Outside of storms on Thursday, min RHs will once again range from 10 to 20 percent with afternoon wind gusts ranging from 20 to 30 mph, so we may need another Red Flag Warning as we will be seeing near- critical fire weather conditions. The area of min RHs less than 15 percent is a bit smaller on Thursday and wind gusts are just a bit lighter overall. Through Friday and Saturday we will see afternoon wind gusts decrease slightly and min RHs increase slightly. && .PIH WATCHES/WARNINGS/ADVISORIES... Red Flag Warning until 10 PM MDT this evening for IDZ410-411- 413-422-425-427-475-476. && SHORT TERM...Keyes LONG TERM...AMM AVIATION...TAX FIRE WEATHER...Keyes
The Pocatello radar (KSFX), 153 km away, was scanning. The volume nearest the first event began at 19:31 UTC.
3 thunderstorm wind. Local standard time, as filed.
A 61 mph thunderstorm outflow wind recorded at the Geneva Summit mesonet station on US Highway 89.
The Niter mesonet station recorded a 60 mph thunderstorm outflow wind gust.
The Soda Springs East mesonet station recorded a 60 mph thunderstorm outflow wind gust.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2025Every state in 2025This day in weather historyWarnings in Idaho, August 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: 1288937, 1288938, 1288946.