Extreme eastern Idaho received some flash flooding and severe winds.
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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 PIH wrote it up.
Extreme eastern Idaho received some flash flooding and severe winds.
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 Sep 3, 1:13 PM MST, 0 minutes earlier.
Area Forecast Discussion National Weather Service Pocatello ID 213 PM MDT Tue Sep 3 2024 .SHORT TERM...Satellite imagery shows center of upper low over the Central Mountains this afternoon. Band of showers/thunderstorms active over the Lemhi region just ahead of the trough axis. Main band of activity occurring over the highlands mainly east of I-15, though a few very light showers/sprinkles still possible across the Snake Plain early this afternoon. Winds so far have been slow to increase through the Snake Plain in dry slot just ahead of main shortwave axis, but lingering cloud cover may still be limiting mixing potential. Thunderstorm activity expected to continue this afternoon in these aforementioned areas, then decrease to more isolated coverage this evening. Once the trough axis slips east, dry conditions will be in place all areas. Another interesting feature of note with this upper trough is the wall of smoke wrapped around the low, slowly dropping southeast across the region. Much of this smoke is vertically integrated, meaning throughout the atmospheric column, however some visibility restriction is noted in upstream observations. HRRR smoke fields paint widespread near-surface visibility restriction sliding across SE Idaho overnight, exacerbated by nighttime inversions. There is some potential that the HRRR is not yet picking up some of the newer fire activity from the past 24-36 hours, so smoke inundation may be slightly underdone in the forecast. Upper ridge begins to rebuild to the west with northwest flow in place through Wednesday night, as trough axis fully exits SE Idaho during the day Wednesday. DMH .LONG TERM...Thursday through next Tuesday. High pressure will rebuild over the West mid-week, meaning dry conditions and a return to temperatures just above normal to finish off the week. Friday and Saturday will be the driest days of the extended period. However, the ridge will become suppressed as a weak shortwave moves onshore on Sunday, bringing low-end chance PoPs, around 30% or less, to Southeast Idaho Sunday through Tuesday. At this time, temperatures don't look to take much of a hit, with highs still remaining right around normal in the low 80s and cooler. Cropp && .AVIATION... Isolated to scattered thunderstorms will continue in the vicinity of KDIJ through mid-afternoon. Winds will remain breezy at all terminals through early evening, generally sustained winds to around 15 kts and gusts to 25 kts, as the front passes today. Behind the departing low pressure system, upper flow will turn more northerly tonight which will bring increased wildfire smoke into SE Idaho and lead to reductions in VIS, especially at KSUN. High pressure overhead through late week will mean light winds and dry conditions. It will also keep smoke trapped over the region and likely mean a continuation of reduced surface visibilities, as well. Cropp && .FIRE WEATHER...Upper low shifting through East Idaho for the remainder of today. Scattered thunderstorms remain possible along the Montana and Wyoming borders this afternoon, and Red Flag Warning remains in place for ID Zones 475, 476, 411, and 413. Localized wetting rains will be possible with stronger cells, but not expected across a zone average. Winds will continue to increase in the Snake Plain as drier air works into the region this afternoon, but anticipated to drop off with sunset this evening. Storms become more isolated through the evening, and should be all but gone after midnight. Upper trough continues to sag through the region, exiting during the day Wednesday. Ridge gradually shifts east across the region through Saturday, allowing moisture to return by Sunday. DMH && .AIR QUALITY... An Air Quality Advisory remains in effect for Custer County through Thursday afternoon, where smoke from regional wildfires is keeping air quality degraded to "Unhealthy for Sensitive Groups." Upper flow will turn northerly behind the departing system which will mean an increase in wildfire smoke across Southeast Idaho. Smoke will be trapped over the area under a high pressure ridge through late week, likely leading to widespread degraded air quality. Cropp && .PIH WATCHES/WARNINGS/ADVISORIES... Red Flag Warning until 5 PM MDT this afternoon for IDZ411-413- 475-476. &&
The Pocatello radar (KSFX), 146 km away, was scanning. The volume nearest the first event began at 20:09 UTC.
1 flash flood, 1 thunderstorm wind. Local standard time, as filed.
A NWS employee reported significant water running along the shoulders of Idaho 33 in Driggs due to heavy rainfall from thunderstorms. Street flooding in the area of 3rd St and Little Ave.
A 58 mph wind gust measured at Medicine Lodge PC371.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2024Every state in 2024This day in weather historyWarnings in Idaho, September 2024
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: 1216410, 1216411.