A cold front brought some severe weather to southeast Idaho.
Every event with a place to put it. Tap one for its entry below.
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.
A cold front brought some severe weather to 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 Sep 1, 1:09 PM MST, 1 hour 51 minutes earlier.
Area Forecast Discussion National Weather Service Pocatello ID 209 PM MDT Fri Sep 1 2023 .SHORT TERM... Afternoon satellite imagery shows clouds continuing to stream northward across the region. Precip has been slow to develop this afternoon but radar returns are gradually beginning to pick up and activity is expected to become more widespread throughout the remainder of the afternoon and into the evening hours. Some of the storms could be strong to borderline severe with gusty winds being the primary threat along with locally heavy rain. Winds remain breezy out of the south/southwest today as a prolonged period of cloudy, rainy weather is expected for the holiday weekend. Hi-res CAMs show precip chances generally ending after midnight but kept PoPs in the forecast during the overnight hours to account for any stray lingering shower/storm potential. Scattered coverage of showers and thunderstorms will return throughout the afternoon hours Saturday with a lesser severe threat as continued above normal PWATs support locally heavy rain with stronger, training, or slow moving storms into Sunday. McKaughan .LONG TERM...Sunday through Friday. Upper level low will track east through Idaho in the Sunday through Monday time frame with most of southeast Idaho with near 100 percent chance of over 0.5 inches and a high chance of over an inch as well, especially mountain locations. Will see a drying trend Tuesday but still widespread mountain showers mainly in the eastern highlands. And Wednesday through Friday expect only isolated mountain showers and thunderstorms. Will have cooler than normal highs Sunday mainly in the 60s mountains and 70s lower elevations and Monday will be the coldest day with mountain highs in the 40s and 50s and low elevations in the 60s with extensive rainfall expected. Tuesday through next Friday will see a warming trend with low elevations back into the mid 70s to 80s by Thursday and Friday. GK && .AVIATION... Cloud cover continues to increase across the region as a prolonged period of clouds and precip will be in place through the holiday weekend. Precip chances will likely diminish a bit overnight but fire up again by Saturday afternoon. For now, VFR expected to prevail through the period despite the clouds. Localized MVFR/IFR reductions will be possible however around any precip. Breezy winds will also diminish after sunrise and things won't be as breezy across the region on Saturday. McKaughan && .FIRE WEATHER... A RED FLAG WARNING remains in effect this evening for scattered thunderstorms in zones 410 and 413. Expect more coverage in zone 413. Will have isolated thunderstorms in the other zones. The trend of rain and thunderstorms will continue through the whole weekend with a near 100 percent chance of wetting rains for all zones by Monday evening. Many areas will receive over an inch of rain total. So all impacts will be rain and thunderstorm related the next 4 days with potential heavy extended weekend rains. GK && .PIH WATCHES/WARNINGS/ADVISORIES... Red Flag Warning until 10 PM MDT this evening for IDZ410-413. Wind Advisory until 10 PM MDT this evening for IDZ056-057. &&
Special Weather Statement
National Weather Service Pocatello ID
324 PM MDT Fri Sep 1 2023
IDZ053-064>066-012215-
Centennial Mountains/Island Park ID-Big Hole Mountains ID-
Upper Snake River Plain ID-Teton Valley ID-
324 PM MDT Fri Sep 1 2023
...A strong thunderstorm will impact portions of south central
Fremont and northeastern Madison Counties through 415 PM MDT...
At 323 PM MDT, Doppler radar was tracking a strong thunderstorm over
Teton, or 7 miles east of Rexburg, moving north at 25 mph.
HAZARD...Winds in excess of 45 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Rexburg, Ashton, Marysville, Sugar City, Teton, Parker, Chester,
Ashton Reservoir, St Anthony, Newdale, and northern Saint Anthony
Sand Dunes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4377 11146 4377 11177 4416 11187 4412 11140
TIME...MOT...LOC 2123Z 178DEG 22KT 4385 11165
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...45 MPH
AMPreliminary Local Storm Report
National Weather Service Pocatello ID
356 PM MDT Fri Sep 1 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0356 PM Hail Ashton 44.07N 111.45W
09/01/2023 E0.70 inch Fremont ID Trained Spotter
nickle to dime sized hail.
&&
mhThe Pocatello radar (KSFX), 146 km away, was scanning. The volume nearest the first event began at 21:59 UTC.
3 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds knocked over a large tree in Ashton onto a pickup truck.
Trees and power lines were reported downed from thunderstorm winds in Chester.
A 58 mph wind gust measured at Sawtooth Portable site.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2023Every state in 2023This day in weather historyWarnings in Idaho, September 2023
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: 1141866, 1141867, 1141865.