A persistent upper low over Washington favored ample moisture transport into the area. Shear was fairly limited throughout, hence wind gusts were the main concern with these storms, along with potential for heavy rain. Small hail was expected, but a few reports of severe level hail were relayed.

Heavy Rain in CASCADE, MONTANA
From 24-AUG-22 03:00:00 to 24-AUG-22 07:45:00 (MST-7)
Location: CENTERVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rain reported to have fallen since 4 AM the same day. Ponding of water was reported in spots, along with filled ditches.

Hail in BROADWATER, MONTANA
From 25-AUG-22 15:30:00 to 25-AUG-22 15:30:00 (MST-7)
Location: TOWNSEND
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of ping pong sized hail.

Heavy Rain in CASCADE, MONTANA
From 24-AUG-22 20:00:00 to 25-AUG-22 05:55:00 (MST-7)
Location: BLACK EAGLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Total overnight rainfall. Total time estimated.

Thunderstorm Wind in TETON, MONTANA
From 26-AUG-22 14:00:00 to 26-AUG-22 14:00:00 (MST-7)
Location: BYNUM
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 60 mph gust was reported between 3 and 4 PM.

Heavy Rain in TETON, MONTANA
From 25-AUG-22 19:21:00 to 25-AUG-22 19:21:00 (MST-7)
Location: BYNUM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Additional reports of pea sized hail.

Heavy Rain in CHOUTEAU, MONTANA
From 25-AUG-22 19:15:00 to 25-AUG-22 20:45:00 (MST-7)
Location: WOODS ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A coop observer reported 1.57 inches of rain fell over 90 minutes during a thunderstorm.

Thunderstorm Wind in TETON, MONTANA
From 26-AUG-22 15:00:00 to 26-AUG-22 15:00:00 (MST-7)
Location: BYNUM
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 65 mph gust was reported between 4 and 5 PM.

Tornado in BLAINE, MONTANA
From 26-AUG-22 11:18:00 to 26-AUG-22 11:29:00 (MST-7)
Location: CLEVELAND
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Tribal Official

Photos submitted to NWS of a tornado on the backside of a single supercell near Ft. Belknap Reservation. Official indicated that the tornado was south of Ft Belknap Agency and near Wild Horse Butte. No known damage was been reported or observed.

Heavy Rain in CASCADE, MONTANA
From 24-AUG-22 01:02:00 to 24-AUG-22 01:02:00 (MST-7)
Location: GREAT FALLS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reports rain fell over 15 minutes.

Hail in BROADWATER, MONTANA
From 25-AUG-22 16:07:00 to 25-AUG-22 16:07:00 (MST-7)
Location: TOWNSEND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Social media post from the Townsend area showed quarter sized hail.

Hail in TETON, MONTANA
From 25-AUG-22 17:16:00 to 25-AUG-22 17:26:00 (MST-7)
Location: FARMINGTON
Magnitude: 1.00 
Reported by: Trained Spotter

Large amounts of quarter sized hail on Hwy 220 4 miles outside of Choteau.

Thunderstorm Wind in GALLATIN, MONTANA
From 24-AUG-22 20:56:00 to 24-AUG-22 20:59:00 (MST-7)
Location: BELGRADE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Asos kbzn Bozeman Yellowstone Airport.

Hail in BROADWATER, MONTANA
From 25-AUG-22 16:15:00 to 25-AUG-22 16:15:00 (MST-7)
Location: TOWNSEND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report via social media of quarter sized hail.