An unstable northwest flow aloft resulted in the development of a few severe thunderstorms across portions of the Billings Forecast Area. Large hail along with strong winds brought numerous reports of damage to cars on the west end of Billings. The storm dropped 1.11 inches of rain in 30 minutes at the National Weather Service Office on the west side of town, with the airport only receiving 0.33 inches. The hail ranged in size from pea to golf ball with the golf ball size falling across a narrow swath on the west end of town. The copious amounts of hail, mainly small, combined with the heavy rain, clogged storm drains across portions of the city. This resulted in numerous intersections and parking lots flooding with at least a foot of water.

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:27:00 to 27-JUL-18 15:27:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:29:00 to 27-JUL-18 15:29:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:30:00 to 27-JUL-18 15:30:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:31:00 to 27-JUL-18 15:31:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:34:00 to 27-JUL-18 15:34:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in STILLWATER, MONTANA
From 27-JUL-18 15:35:00 to 27-JUL-18 15:35:00 (MST-7)
Location: COLUMBUS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:36:00 to 27-JUL-18 15:36:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:43:00 to 27-JUL-18 15:43:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STILLWATER, MONTANA
From 27-JUL-18 15:45:00 to 27-JUL-18 15:45:00 (MST-7)
Location: COLUMBUS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in YELLOWSTONE, MONTANA
From 27-JUL-18 15:43:00 to 27-JUL-18 17:00:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water was reported to be several feet deep in several locations throughout Billings.

Hail in CARTER, MONTANA
From 27-JUL-18 13:55:00 to 27-JUL-18 13:55:00 (MST-7)
Location: ALZADA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CARTER, MONTANA
From 27-JUL-18 14:00:00 to 27-JUL-18 14:00:00 (MST-7)
Location: ALZADA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STILLWATER, MONTANA
From 27-JUL-18 14:55:00 to 27-JUL-18 14:55:00 (MST-7)
Location: REED PT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STILLWATER, MONTANA
From 27-JUL-18 14:58:00 to 27-JUL-18 14:58:00 (MST-7)
Location: MOLT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail combined with strong winds resulted in significant crop damage.

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:21:00 to 27-JUL-18 15:21:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:25:00 to 27-JUL-18 15:25:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 27-JUL-18 15:25:00 to 27-JUL-18 15:25:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 27-JUL-18 15:25:00 to 27-JUL-18 15:25:00 (MST-7)
Location: BILLINGS LOGAN ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter