An upper level trough moved through Montana for Sunday April 18th. As it did so, it brought a cold front and associated moisture through the area, which resulted in rain that quickly turned to snow as colder air arrived. While most of the area received light snow (generally about an inch or less), areas prone to upslope snow showers along the Rocky Mountain Front and along the north slopes of the Little Belts and Snowy Mountains. A few areas received over 6 of snow with this system, which combined with the icy roads, resulted in a few accidents, including one that blocked Rodger's Pass for a few hours while crews removed a jackknifed tractor trailer.

Heavy Snow in SOUTHERN LEWIS AND CLARK, MONTANA
From 18-APR-21 14:00:00 to 19-APR-21 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Lincoln volunteer fire department estimated between 6 to 12 inches of snow at rogers pass. Semi jackknifed on the pass. Significant drifting of snow.

Heavy Snow in JUDITH BASIN, MONTANA
From 18-APR-21 15:00:00 to 19-APR-21 03:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reports 7.5 inches of snow.

Heavy Snow in SOUTHERN ROCKY MOUNTAIN FRONT, MONTANA
From 18-APR-21 13:00:00 to 18-APR-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow had mostly stopped by 9pm last night. most of the accumulation occurred during the day.

Heavy Snow in CASCADE, MONTANA
From 18-APR-21 17:00:00 to 19-APR-21 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee reports snowfall of 6.8 inches. Snow began about two hours before it began to accumulate (start time of accumulation is used as start time).

Winter Weather in FERGUS, MONTANA
From 18-APR-21 16:00:00 to 19-APR-21 07:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained Spotter reports 5 inches of snow.

Winter Weather in SOUTHERN ROCKY MOUNTAIN FRONT, MONTANA
From 18-APR-21 13:00:00 to 19-APR-21 09:15:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reports 5 inches of snow.

Winter Weather in EASTERN TETON, MONTANA
From 18-APR-21 13:00:00 to 19-APR-21 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reports 5 inches of snow.

Winter Weather in NORTH ROCKY MOUNTAIN FRONT, MONTANA
From 18-APR-21 13:00:00 to 19-APR-21 07:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reports 4.5 inches of snow.

Winter Weather in CASCADE, MONTANA
From 18-APR-21 16:00:00 to 19-APR-21 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Co-op observer station snrm8 sun river 4s coop reports 4.5 inches of snow.

Winter Weather in JUDITH BASIN, MONTANA
From 18-APR-21 16:00:00 to 19-APR-21 06:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reports 4 inches of snowfall.

Winter Weather in JEFFERSON, MONTANA
From 18-APR-21 17:00:00 to 19-APR-21 07:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reports 4 inches of snow.

Winter Weather in GALLATIN, MONTANA
From 18-APR-21 20:00:00 to 19-APR-21 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Social media report of 4 inches near Church Hill.

Winter Weather in SOUTHERN LEWIS AND CLARK, MONTANA
From 18-APR-21 15:00:00 to 18-APR-21 22:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reports 3.5 inches of snow.

Winter Weather in BEAVERHEAD, MONTANA
From 19-APR-21 04:00:00 to 19-APR-21 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Cocorahs station mt-bv-22 glen cocorahs reports 3.2 inches of snow.