A 60 mph thunderstorm outflow wind measured 9 miles east of Butte City.
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The episode as NWS PIH wrote it up.
A 60 mph thunderstorm outflow wind measured 9 miles east of Butte City.
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 May 29, 4:36 PM MST, 34 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Pocatello ID 536 PM MDT Thu May 29 2025 .KEY MESSAGES... - Isolated thunderstorms and scattered showers expected this afternoon and tonight in the upper Snake River highlands. - Warming trend will lead to near-record high temperatures on Saturday. - A low entering the intermountain west on Sunday night will bring strong cooling and precipitation. && .SHORT TERM /THROUGH SUNDAY/... Issued at 140 PM MDT Thu May 29 2025 This period will turn very dry and hot for this time of year after this evening. Right now, convection is starting to pop up in the upper Snake River highlands and especially just north of the ID-MT border. Cells are tracking southeastward and so expect cells to move into the forecast area, tracking as far south as the Big Hole mountains. There should be a strong slow down around 1800 MDT, with convection shutting off after midnight. Not expecting any issues with convection or precipitation again until Sun afternoon. Incoming low pressure still could be a closed low with moderate amounts of precipitation and convection, or an open wave bringing moderate to strong wind and lighter amounts of precipitation with convection. But not a great chance of experiencing precipitation on Sun afternoon, with slight chances everywhere except in the Bear Lake basin. Temperatures will be the highlight of this period. Guidance is still forecast record-tying afternoon highs on Sat for Pocatello airport. North wind in the upper Snake River plain may linger long enough to prevent records in Rexburg and Idaho Falls, but it will be close. With a nearly cloudless sky, expect large temperature swings from morning low to afternoon high. Border line Heat Advisory criteria were being met in Challis-Ellis, and Malta-Almo areas, but very limited in extent. Temperatures cool down on Sun thanks to increasing cloud cover from the incoming low. Under the high pressure, wind will be light, then on Sun it should get at least breezy for the Snake River plain and eastern Magic Valley. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... Issued at 140 PM MDT Thu May 29 2025 Today's theme for the long term forecast is: QPF whiplash. Yesterday, the long term forecast looked cool and wet. While there is still decent confidence in cooler (than Saturday) temperatures, total moisture heading our way has significantly decreased. This is main due to a change in models showing what is currently Tropical Storm Alvin in the Eastern Pacific moving more eastward than northeastward like they showed yesterday. The low they also showed dropping south out of British Columbia is now more of a deep trough instead of a closed low traveling almost directly over Eastern Idaho. This has taken our forecast QPF totals of a widespread quarter to half inch for valleys down to only a tenth of an inch and our 1 to 1.25 inches in the mountains down to only a quarter to a half inch. This is a significant drop, but we will really have to watch and see how TS Alvin evolves and the direction it takes along with the trough dropping out of Canada early next week and how strong it will be. There is still agreement on a cool down with highs falling into the low and mid 70s on Monday, mid to upper 60s on Tuesday, and back into the low 70s by Wednesday. This isn't quite as dramatic of a drop as what had been in the forecast (due to the same changes mentioned above with respect to QPF), and models still have quite the range in temperatures for Monday through Wednesday, so we will continue to play the "wait and see" game for now. The second half of the week looks warmer and drier at this point. && .AVIATION /00Z TAFS THROUGH 00Z SATURDAY/... Issued at 535 PM MDT Thu May 29 2025 Still seeing some isolated showers and thunderstorms mainly from around KIDA north towards the Montana border this afternoon. KDIJ remains the most likely location to potentially see a brief shower but it appears that they'll likely stay just north. Could see some erratic and gusty winds over the next hour or two with the light synoptic flow taking over thereafter. Skies overnight and throughout the day should be mostly clear keeping VFR in place. Precip chances look very low, if any, regionwide tomorrow. && .FIRE WEATHER... Issued at 245 AM MDT Thu May 29 2025 Above normal temperatures and mostly dry conditions will continue through the start of the weekend, with isolated showers and thunderstorms possible this afternoon ahead of dry conditions back regionwide for Friday and Saturday. Highs through the weekend will be about 10-20 degrees above normal for this time of year in the 70s/80s/90s. Temperatures will peak on Saturday, with record warmth expected. Aside from some isolated showers and storms today, hot and dry conditions will be the overall trend with humidities each day across lower elevations dropping to the teens/20s, possible even into the single digits on Saturday. Our next system remains on track to move in late Sunday into Monday with colder temperatures, scattered showers and thunderstorms, and mountain snow showers above around 8000 feet through Tuesday and Wednesday. By Tuesday, highs will have dropped from near record to record levels on Saturday to the 40s/50s/60s. Precipitation totals will come into focus over the coming days as model guidance continues to struggle on exactly how this ridge of high pressure ultimately breaks down and what ends up replacing it but confidence remains high on cooler temperatures. && .PIH WATCHES/WARNINGS/ADVISORIES... None. && SHORT TERM...Messick LONG TERM...AMM AVIATION...McKaughan FIRE WEATHER...MacKay
Special Weather Statement
National Weather Service Pocatello ID
302 PM MDT Thu May 29 2025
IDZ066-292145-
Centennial Mountains/Island Park ID-
302 PM MDT Thu May 29 2025
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN FREMONT COUNTY
THROUGH 345 PM MDT...
At 301 PM MDT, Doppler radar was tracking a strong thunderstorm over
Henrys Lake, moving east at 5 mph.
HAZARD...Wind gusts in excess of 45 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
Locations impacted include...
Henrys Lake, Island Park Village, Macks Inn, Big Springs, Targhee
Pass, Raynolds Pass, and Red Rock Pass.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
If on or near Henrys Lake, get out of the water and move indoors or
inside a vehicle. Strong winds will create rough chop.
Remember, lightning can strike out to 10 miles from the parent
thunderstorm. If you can hear thunder, you are close enough to be
struck by lightning. Move to safe shelter now! Do not be caught on
the water in a thunderstorm.
&&
LAT...LON 4445 11121 4454 11150 4454 11146 4456 11151
4459 11152 4465 11150 4464 11150 4468 11147
4471 11149 4471 11142 4473 11140 4473 11132
4470 11129 4467 11127 4465 11128 4465 11125
4462 11122 4461 11124 4458 11123 4457 11118
TIME...MOT...LOC 2101Z 282DEG 6KT 4463 11141
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...45 MPH
13Special Weather Statement
National Weather Service Pocatello ID
357 PM MDT Thu May 29 2025
IDZ067-292230-
Beaverhead/Lemhi Highlands ID-
357 PM MDT Thu May 29 2025
...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL CLARK COUNTY
THROUGH 430 PM MDT...
At 356 PM MDT, Doppler radar was tracking a strong thunderstorm
about 2 miles south of Dubois, moving east at 15 mph.
HAZARD...Wind gusts in excess of 35 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
This storm will remain over mainly rural areas of south central Clark
County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4407 11233 4415 11232 4417 11205 4406 11205
TIME...MOT...LOC 2156Z 272DEG 11KT 4411 11224
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...35 MPH
13Special Weather Statement
National Weather Service Pocatello ID
400 PM MDT Thu May 29 2025
IDZ066-292230-
Centennial Mountains/Island Park ID-
400 PM MDT Thu May 29 2025
...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL FREMONT COUNTY
THROUGH 430 PM MDT...
At 359 PM MDT, Doppler radar was tracking a strong thunderstorm over
Last Chance, or 18 miles south of Henrys Lake, moving east at 15 mph.
HAZARD...Wind gusts in excess of 35 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
Locations impacted include...
Ponds Lodge, Last Chance, Island Park Reservoir, and Harriman State
Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
If on or near Island Park, get out of the water and move indoors or
inside a vehicle. Strong winds will create rough chop.
Remember, lightning can strike out to 10 miles from the parent
thunderstorm. If you can hear thunder, you are close enough to be
struck by lightning. Move to safe shelter now! Do not be caught on
the water in a thunderstorm.
&&
LAT...LON 4432 11151 4446 11151 4446 11115 4423 11116
TIME...MOT...LOC 2159Z 272DEG 11KT 4438 11142
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...35 MPH
13The Pocatello radar (KSFX), 57 km away, was scanning. The volume nearest the first event began at 00:08 UTC.
1 thunderstorm wind. Local standard time, as filed.
A 60 mph thunderstorm outflow wind measured 9 miles east of Butte City at the Dead Man Canyon mesonet site.
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, May 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: 1269645.