A microburst in the morning caused damage in Ammon.
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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.
A microburst in the morning caused damage in Ammon.
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 20, 4:20 AM MST, 3 hours 40 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Pocatello ID 520 AM MDT Wed Aug 20 2025 .KEY MESSAGES... - Weak shortwave trough today will support an increase in cloud cover and isolated showers/virga and dry thunderstorms, as otherwise warm and dry conditions will continue. - Elevated fire weather conditions will exist today with afternoon RHs in the teens/20s coupled with breezy winds. - Monsoon moisture lifting north late Saturday into Sunday will support the return of daily shower and thunderstorm chances into early next week as temperatures trend cooler. && .SHORT TERM /THROUGH THURSDAY NIGHT/... Issued at 135 AM MDT Wed Aug 20 2025 Early morning satellite imagery shows a shortwave trough lifting northeast out of the Great Basin into eastern Idaho, leading to an increase in cloud cover along with supporting isolated showers and virga throughout the day. Given a very dry environment at the surface, little to no precipitation is expected out of any of this activity, with any isolated dry thunderstorms expected to remain southeast of the Snake River Plain. Activity will subside after sunset tonight, with dry conditions back overnight into Thursday, outside of isolated showers and storms around the Bear Lake region Thursday afternoon. Highs today and Thursday will be a bit cooler overall from the near record to record heat we saw yesterday, with highs in the mid 80s to mid 90s. Winds will see a diurnal increase each afternoon, with wind gusts peaking around 15-30 mph. && .LONG TERM /FRIDAY THROUGH TUESDAY/... Issued at 135 AM MDT Wed Aug 20 2025 Hot and dry conditions will continue for Friday into Saturday with highs in the mid 80s to mid 90s, as the leading edge of a push of monsoonal moisture begins to build in late Saturday into Sunday. As a result of this increased moisture transport into our area, isolated showers and thunderstorms south of the Snake River Plain will be possible Saturday afternoon and evening, ahead of a regionwide expansion to all of eastern Idaho for Sunday into Monday where we will see an increase to isolated to scattered coverage. Temperatures will respond quickly to the increased cloud cover and moisture building in, leading to cooler temperatures early next week as highs return to the 70s/80s starting Monday. Early next week is shaping up to be the most robust push of monsoon moisture we have seen so far this year with widespread precipitation chances expected Sunday through at least next Wednesday. PWAT anomalies starting Sunday will climb to 150-200% of normal through Thursday, supporting stronger storms that will be capable of producing heavy rain. Any rain will certainly be much appreciated out here at our office at Pocatello Regional Airport, as yesterday marked the 46th consecutive day of no measurable precipitation. This ties the 7th longest stretch in recorded history since 1939. With the GEFS/EPS ensembles showing unanimous agreement on widespread precipitation next week, this streak looks like it will be coming to a close as we finish out the month of August. && .AVIATION /12Z TAFS THROUGH 12Z THURSDAY/... Issued at 520 AM MDT Wed Aug 20 2025 Predominant VFR and dry conditions will continue today into tonight as a shortwave trough passes overhead, supporting increased cloud cover and isolated showers/virga and dry thunderstorms. Have added the mention of VCSH to KPIH, KIDA, KBYI, and KDIJ today to account for timing out shower activity, with any precipitation remaining limited given a very dry environment at the surface. Winds will see a diurnal increase this afternoon with gusts up to around 15-20 kts. && .FIRE WEATHER... Issued at 135 AM MDT Wed Aug 20 2025 Following near record to record warmth regionwide yesterday, a shortwave trough passing overhead today will lead to an increase in cloud cover along with supported isolated showers and virga throughout the day. Given a very dry environment at the surface, little to no precipitation is expected out of any of this activity, with any isolated dry thunderstorms expected to remain southeast of the Snake River Plain. Activity will subside after sunset tonight, with dry conditions back overnight into Thursday, outside of isolated showers and storms around the Bear Lake region Thursday afternoon. Highs today and Thursday will be a bit cooler overall from the near record to record heat we saw yesterday, with highs in the mid 80s to mid 90s. Winds will see a diurnal increase each afternoon, with wind gusts peaking around 15-30 mph. Afternoon RHs will continue to be very dry in the single digits/teens through the end of the week, however widespread critical fire weather conditions are not expected. The best overlap of winds/RH will be today with gusts peaking around 15-30 mph, supporting elevated fire weather conditions. Dry conditions will return regionwide for Friday into much of Saturday, as the leading edge of a push of monsoonal moisture begins to build in late Saturday into Sunday. As a result of this increased moisture transport into our area, isolated showers and thunderstorms south of the Snake River Plain will be possible Saturday afternoon and evening, ahead of a regionwide expansion to all of eastern Idaho for Sunday into Monday where we will see an increase to isolated to scattered coverage. Temperatures will respond quickly to the increased cloud cover and moisture building in, leading to cooler temperatures and higher RH early next week as highs return to the 70s/80s starting Monday. Early next week is shaping up to be the most robust push of monsoon moisture we have seen so far this year with widespread precipitation chances expected Sunday through at least next Wednesday. PWAT anomalies starting Sunday will climb to 150-200% of normal through Thursday, supporting stronger storms that will be capable of producing heavy rain and lead to an increased threat of burn scar impacts associated with training or slow moving thunderstorms. && .PIH WATCHES/WARNINGS/ADVISORIES... None. && SHORT TERM...MacKay LONG TERM...MacKay AVIATION...MacKay FIRE WEATHER...MacKay
The Pocatello radar (KSFX), 69 km away, was scanning. The volume nearest the first event began at 14:57 UTC.
1 thunderstorm wind. Local standard time, as filed.
Two large carports were destroyed and blown into a wooden fence knocking it down. A trampoline landed on a utility trailer in the side of a residential yard. Several large tree limbs were knocked off a tree with isolated damage at a couple housed in the Ammon neighborhood.
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: 1288918.