Montana, 2025Hail and Strong Wind in Montana, July 31, 2025
July 31, 2025 · NWS MSO · 5 events in 4 counties and zones
Slow-moving thunderstorms, enhanced by anomalously high atmospheric moisture, brought periods of heavy rain and large hail to portions of west-central and southwest Montana.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
Open the live radar over this ground
- Deaths
- 0
- Injuries
- 0
- Property damage
- $1,000
- Crop damage
- None recorded
- Events
- 5
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.
Slow-moving thunderstorms, enhanced by anomalously high atmospheric moisture, brought periods of heavy rain and large hail to portions of west-central and southwest Montana.
Event by event
2 hail, 2 strong wind, 1 heavy rain. Local standard time, as filed.
Heavy Rain, Silver Bow
- When
- July 31, 4:10 PM MST to 5:00 PM MST
- Where
- Silver Bow County, 1.07 mi WSW of Walkerville to 1.69 mi NNW of (Btm)mooney Arpt But
- Reported by
- Public
- Coordinates
- 46.023, -112.549
A thunderstorm over Butte produced hail estimated close to one inch in diameter and caused flash flooding near Schley Avenue. Over an inch of rain fell in one hour, overwhelming local storm drains and leading to a flooded basement, an overflowing manhole, and significant water ponding on streets and in nearby parking lots.
Hail, Missoula
- When
- July 31, 4:46 PM MST to 5:10 PM MST
- Where
- Missoula County, 2.37 mi NNE of Carlton
- Measured
- 1.25 in hail
- Reported by
- Social Media
- Coordinates
- 46.729, -114.074
Hail estimated slightly over one inch in diameter was reported in Lolo, an event confirmed by at least two separate photos submitted by local residents.
Strong Wind, Missoula / Bitterroot Valleys
- When
- July 31, 4:50 PM MST to 5:15 PM MST
- Where
- Missoula / Bitterroot Valleys forecast zone
- Measured
- 48 kt (55 mph) estimated gust
- Property damage
- $500
- Reported by
- Social Media
- Coordinates
- 46.560, -114.023 (the zone’s center; the record gives no point)
In Darby, at least two trees were felled, power lines were damaged, and a lightning strike started a grass fire on Gorus Loop.
Hail, Missoula
- When
- July 31, 5:40 PM MST to 6:15 PM MST
- Where
- Missoula County, 0.53 mi NE of Grass Vly
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 46.974, -114.211
A slow-moving thunderstorm impacted the area northwest of Missoula, producing both large hail and heavy, localized rainfall. Quarter-sized (1.00 inch) hail was estimated via photos near the Frenchtown Mill. The storm's torrential downpour resulted in an official measurement of 0.92 inches at the Missoula International Airport (KMSO), with radar estimating up to 1.40 inches nearby. This intense rainfall overwhelmed drainage systems on Broadway, causing water to flood the eastbound lane. A downed tree was reported on the northbound lane of Highway 83 near milepost 31, north of Summit Lake.
Strong Wind, Flathead/Mission Valleys
- When
- July 31, 8:00 PM MST to 9:45 PM MST
- Where
- Flathead/Mission Valleys forecast zone
- Measured
- 49 kt (56 mph) estimated gust
- Property damage
- $500
- Reported by
- Department of Highways
- Coordinates
- 47.872, -114.424 (the zone’s center; the record gives no point)
Strong outflow winds swept through the northern Flathead Valley, with the Elmo MDT station reporting a peak gust of 59 mph. Nearby, the Glacier Park International Airport (KGPI) recorded gusts up to 38 mph. Approximately 100 people were without power. Conditions on Flathead Lake were also hazardous, where a boater near Wildhorse Island reported high winds, white caps, and three-foot swells. Confirming the turbulent weather, a mesonet at the Flathead Lake Biological Station's Narrows site registered a peak wind speed of 45 mph.
- Heavy Rain
- Rainfall totals unusual for the place and season that did not produce a flood.
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- Strong Wind
- Non-thunderstorm winds below high wind criteria that nonetheless caused damage or casualties.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Flash Flooding in Maryland, July 31, 20251 death · 26 events
- Heat in Virginia, July 31, 20251 death · 1 event
- Rip Current in Wisconsin, July 31, 20251 death · 1 event
- Wildfire in Washington, July 31, 2025$2.7 million · 1 event
- Wildfire in Washington, July 31, 2025$1.0 million · 1 event
- Damaging Winds in Texas, July 31, 20251 injured · $275,000 · 60 kt wind · 8 events
- Flash Flooding in Pennsylvania, July 31, 2025$240,000 · 17 events
- Wildfire in Washington, July 31, 2025$320,000 · 1 event
- Tornado and Damaging Winds in Maryland, July 31, 2025$121,000 · EF0 · 6 events
- Flash Flooding and Flood in New Jersey, July 31, 2025$65,000 · 18 events
- Flash Flood and Damaging Winds in Virginia, July 31, 2025$61,000 · 55 kt wind · 5 events
- Damaging Winds in Virginia, July 31, 2025$26,000 · 50 kt wind · 6 events
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 2026-10-01. Each event’s entry at NCEI: 1286106, 1286109, 1286866, 1286108, 1286867.