Strong vertical shear and moderate CAPE values combined with an upper level disturbance resulted in the development of supercell thunderstorms across the Billings Forecast Area. Large hail and damaging thunderstorm winds occurred during the afternoon and evening hours.

Hail in WHEATLAND, MONTANA
From 08-JUL-13 14:00:00 to 08-JUL-13 14:00:00 (MST-7)
Location: HARLOWTON BAXTER ARP
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SWEET GRASS, MONTANA
From 08-JUL-13 14:23:00 to 08-JUL-13 14:23:00 (MST-7)
Location: MELVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GOLDEN VALLEY, MONTANA
From 08-JUL-13 14:40:00 to 08-JUL-13 14:40:00 (MST-7)
Location: RYEGATE ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong wind gusts were ahead of the approaching thunderstorm.

Thunderstorm Wind in GOLDEN VALLEY, MONTANA
From 08-JUL-13 14:55:00 to 08-JUL-13 14:55:00 (MST-7)
Location: RYEGATE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A lot of marble size hail accompanied the winds.

Funnel Cloud in GOLDEN VALLEY, MONTANA
From 08-JUL-13 15:00:00 to 08-JUL-13 15:00:00 (MST-7)
Location: SLAYTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in TREASURE, MONTANA
From 08-JUL-13 16:38:00 to 08-JUL-13 16:38:00 (MST-7)
Location: MYERS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 3 foot diameter Cottonwood tree was knocked down and several 8 inch diameter tree limbs were broken.

Thunderstorm Wind in TREASURE, MONTANA
From 08-JUL-13 16:40:00 to 08-JUL-13 16:40:00 (MST-7)
Location: MYERS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Six Cottonwood trees were uprooted along with substantial crop damage was reported.

Thunderstorm Wind in TREASURE, MONTANA
From 08-JUL-13 16:45:00 to 08-JUL-13 16:45:00 (MST-7)
Location: BIGHORN
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dime size hail was also reported.

Thunderstorm Wind in TREASURE, MONTANA
From 08-JUL-13 17:00:00 to 08-JUL-13 17:00:00 (MST-7)
Location: SARPY JCT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Four to six inch diameter tree limbs were broken.

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 08-JUL-13 16:08:00 to 08-JUL-13 16:08:00 (MST-7)
Location: NIBES
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

United Grain had two 500,000 bushel grain silos damaged.

Thunderstorm Wind in ROSEBUD, MONTANA
From 08-JUL-13 16:15:00 to 08-JUL-13 16:15:00 (MST-7)
Location: INGOMAR
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A severe thunderstorm that originated in the Lewistown area, having a history of hail and damaging winds, resulted in a microburst by the time it reached Ingomar. A damage assessment indicated enhanced microburst winds upwards of 75 mph. Damage was a quarter mile wide and a mile in length. Numerous structures were impacted with some damage. A corner roof on one house was torn off, a metal shed was destroyed and an RV was rolled.

Thunderstorm Wind in MUSSELSHELL, MONTANA
From 08-JUL-13 15:15:00 to 08-JUL-13 15:15:00 (MST-7)
Location: ROUNDUP ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust was estimated at 60 mph southwest of Flatwillow.

Hail in GOLDEN VALLEY, MONTANA
From 08-JUL-13 14:27:00 to 08-JUL-13 14:27:00 (MST-7)
Location: BARBER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Some windows were broken.

Hail in MUSSELSHELL, MONTANA
From 08-JUL-13 15:15:00 to 08-JUL-13 15:15:00 (MST-7)
Location: ROUNDUP ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MUSSELSHELL, MONTANA
From 08-JUL-13 15:28:00 to 08-JUL-13 15:28:00 (MST-7)
Location: ELSO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust of 60 mph was estimated southeast of Lavina.

Hail in MUSSELSHELL, MONTANA
From 08-JUL-13 15:30:00 to 08-JUL-13 15:30:00 (MST-7)
Location: MUSSELSHELL
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 08-JUL-13 15:35:00 to 08-JUL-13 15:35:00 (MST-7)
Location: BROADVIEW
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A power pole was snapped.

Thunderstorm Wind in MUSSELSHELL, MONTANA
From 08-JUL-13 15:43:00 to 08-JUL-13 15:43:00 (MST-7)
Location: KLEIN
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorm Wind in ROSEBUD, MONTANA
From 08-JUL-13 15:50:00 to 08-JUL-13 15:50:00 (MST-7)
Location: SUMATRA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust of 60 mph was estimated southeast of Melstone.

Thunderstorm Wind in ROSEBUD, MONTANA
From 08-JUL-13 17:05:00 to 08-JUL-13 17:05:00 (MST-7)
Location: FORSYTH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated around 60 mph.

Thunderstorm Wind in ROSEBUD, MONTANA
From 08-JUL-13 17:05:00 to 08-JUL-13 17:05:00 (MST-7)
Location: FORSYTH
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large tree branches were broken.

Thunderstorm Wind in ROSEBUD, MONTANA
From 08-JUL-13 17:10:00 to 08-JUL-13 17:10:00 (MST-7)
Location: FORSYTH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree branches of 6 to 10 inches in diameter were broken.

Thunderstorm Wind in ROSEBUD, MONTANA
From 08-JUL-13 17:15:00 to 08-JUL-13 17:15:00 (MST-7)
Location: COLSTRIP
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts ahead of the thunderstorm resulted in large pine trees downed near the high school.

Thunderstorm Wind in ROSEBUD, MONTANA
From 08-JUL-13 17:25:00 to 08-JUL-13 17:25:00 (MST-7)
Location: BRANDENBERG
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust of 65 mph was estimated north of Brandenberg.

Thunderstorm Wind in CUSTER, MONTANA
From 08-JUL-13 17:30:00 to 08-JUL-13 17:30:00 (MST-7)
Location: GARLAND
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Thunderstorm Wind in CUSTER, MONTANA
From 08-JUL-13 17:40:00 to 08-JUL-13 17:40:00 (MST-7)
Location: GARLAND
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CUSTER, MONTANA
From 08-JUL-13 17:54:00 to 08-JUL-13 17:54:00 (MST-7)
Location: ULMER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was downed blocking traffic on Highway 59 at mile marker 5.

Thunderstorm Wind in FALLON, MONTANA
From 08-JUL-13 17:57:00 to 08-JUL-13 17:57:00 (MST-7)
Location: BAKER ARPT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in CUSTER, MONTANA
From 08-JUL-13 17:58:00 to 08-JUL-13 17:58:00 (MST-7)
Location: (MLS)WILEY FLD MILES
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in ROSEBUD, MONTANA
From 08-JUL-13 17:06:00 to 08-JUL-13 17:06:00 (MST-7)
Location: FORSYTH ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in CUSTER, MONTANA
From 08-JUL-13 18:00:00 to 08-JUL-13 18:00:00 (MST-7)
Location: MILES CITY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Plywood was peeled off a building under construction and thrown across main street in Miles City. Cars were damaged by debris at the Zip Trip.

Hail in FALLON, MONTANA
From 08-JUL-13 18:06:00 to 08-JUL-13 18:06:00 (MST-7)
Location: OLLIE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CUSTER, MONTANA
From 08-JUL-13 18:45:00 to 08-JUL-13 18:45:00 (MST-7)
Location: KNOWLTON
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Thunderstorm Wind in FALLON, MONTANA
From 08-JUL-13 19:00:00 to 08-JUL-13 19:00:00 (MST-7)
Location: PLEVNA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Limbs were broken off trees.

Thunderstorm Wind in CARTER, MONTANA
From 08-JUL-13 19:10:00 to 08-JUL-13 19:10:00 (MST-7)
Location: HAMMOND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree branches were down across a road.

Thunderstorm Wind in FALLON, MONTANA
From 08-JUL-13 19:16:00 to 08-JUL-13 19:16:00 (MST-7)
Location: BAKER ARPT
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

There were also prolonged wind gusts above 58 mph between 816pm and 832pm.

Thunderstorm Wind in FALLON, MONTANA
From 08-JUL-13 19:20:00 to 08-JUL-13 19:20:00 (MST-7)
Location: WILLARD
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local sheriff estimated a gust of 80 mph.

Thunderstorm Wind in GOLDEN VALLEY, MONTANA
From 08-JUL-13 15:00:00 to 08-JUL-13 15:00:00 (MST-7)
Location: RYEGATE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Microburst winds estimated at speeds upwards of 75 mph occurred in the vicinity of Ryegate. The microburst was a quarter mile wide and a mile long with the majority of the damage occurring in the town of Ryegate. Several structures were impacted with mostly minor roof damage. Numerous trees were impacted as large tree limbs were downed and several large pine trees uprooted.

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 08-JUL-13 16:00:00 to 08-JUL-13 16:00:00 (MST-7)
Location: HUNTLEY
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 08-JUL-13 16:05:00 to 08-JUL-13 16:05:00 (MST-7)
Location: SHEPHERD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Significant tree damage was reported 3 miles north of Huntley.

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 08-JUL-13 16:10:00 to 08-JUL-13 16:10:00 (MST-7)
Location: POMPEYS PILLAR
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One tree was uprooted and tree limbs up to 12 inches in diameter were broken. Power outages were also reported.

Thunderstorm Wind in ROSEBUD, MONTANA
From 08-JUL-13 16:15:00 to 08-JUL-13 16:15:00 (MST-7)
Location: SUMATRA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dime size hail was also reported.

Thunderstorm Wind in BIG HORN, MONTANA
From 08-JUL-13 16:30:00 to 08-JUL-13 16:30:00 (MST-7)
Location: HARDIN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Power outages occurred due to falling tree limbs taking out power lines, as well as a power pole being snapped.

Hail in YELLOWSTONE, MONTANA
From 08-JUL-13 16:35:00 to 08-JUL-13 16:35:00 (MST-7)
Location: CUSTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 08-JUL-13 15:52:00 to 08-JUL-13 15:52:00 (MST-7)
Location: SHEPHERD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph just north of Shepherd.

Hail in WHEATLAND, MONTANA
From 08-JUL-13 13:55:00 to 08-JUL-13 13:55:00 (MST-7)
Location: TWODOT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter