Mid level circulation over the Montana/Idaho border, as well as mid level circulation over southeast Montana, was responsible for a large plume of moisture that combined with cold air advecting into central Montana to produce areas of heavy snow on May 10. Snowfall amounts greater than 10 inches were reported in many areas.

Winter Storm in HILL, MONTANA
From 10-MAY-16 17:00:00 to 10-MAY-16 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Eighteen inches of snow fell at Rocky Boy 7SE and ten inches fell at Havre 25S.

Winter Storm in JUDITH BASIN, MONTANA
From 09-MAY-16 17:00:00 to 10-MAY-16 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Eight inches of snow fell at Stanford 3S. Heavy wet snow was reported on numerous roadways and scattered power outages were reported across Judith Basin county. The heavy wet snow required chains be used on towing units on Montana Highway 3 at Garneill to the junction of U.S.-87.

Winter Storm in MEAGHER, MONTANA
From 09-MAY-16 17:00:00 to 10-MAY-16 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Twelve inches of snow fell at Neihart 6WSW, ten inches fell at Checkerboard 12ENE and  White Sulphur Springs 20SE, nine inches fell at White Sulphur Springs 18W, and eight inches fell at Neihart 12SSE. Severe driving conditions were reported throughout Meagher County.

Winter Storm in GALLATIN, MONTANA
From 09-MAY-16 13:20:00 to 10-MAY-16 10:26:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Twenty-two inches of snow fell at Gallatin Gateway 13ESE, sixteen inches fell at Gallatin Gateway 18SE, and eight inches fell at Belgrade 14NE. The heavy snow knocked out the power to five substations in Bozeman. NorthWestern Energy estimated some 30,000 customers, including Montana State University, lost power for several hours.

Winter Storm in BLAINE, MONTANA
From 09-MAY-16 23:00:00 to 10-MAY-16 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Severe driving conditions reported on Montana Highway 66 near the junction with U.S. Highway 191. Power was also reported out in Hays and Lodgepole.

Winter Storm in FERGUS, MONTANA
From 09-MAY-16 17:00:00 to 10-MAY-16 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Twenty-three inches of snow fell at Lewistown 11ESE. Also, seventeen inches fell at Garneill 12ENE and ten inches fell at Lewistown 2SE. Two semi-tractor trailers spun out on U.S.-87, 10 miles east of Lewistown, blocking the west bound lane. A semi-tractor trailer jackknifed on U.S.-87 15 miles west of Lewistown closing the road for an extended period of time. Severe driving conditions were also reported from Garneill to Judith Gap and from Lewistown to Hilger due to snow, wind, slush, and poor visibility. Severe driving conditions were reported near Eddie's Corner.

Winter Storm in CASCADE, MONTANA
From 09-MAY-16 17:00:00 to 10-MAY-16 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Twelve inches of snow fell at Neihart 1SE. The heavy wet snow caused a school bus to
slide off the road near Belt. No injuries were reported. Poor weather conditions in Great Falls caused the cancellation of the track meet scheduled between Great Falls High and C.M. Russell.

Winter Storm in JEFFERSON, MONTANA
From 09-MAY-16 13:20:00 to 10-MAY-16 10:26:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Eleven inches of snow fell at Basin 6N. Also, eight inches fell at Corbin 7NW.