A significant winter storm affects the region. Forecasts remain, generally, on track. Heaviest snow accumulation remains focused on the east slopes of The Rockies and along and to the north of The Little Belts. Total accumulations of 1 foot are forecast across areas of western Teton, NW Lewis and Clark, Judith Basin and Fergus counties near the mountains, where impacts to travel, agricultural and outdoor activities are greatest. Initial shift to northwesterly winds across the northern half of the forecast area with cooling behind the initial frontal feature a bit less aggressive than anticipated. Temperatures cooling to the 40s across the northern tier of the forecast area and to the 30s upstream over Alberta, and cooler temperatures gradually spread south into the
area. Onset of precipitation is somewhat nebulous with showers increasing through early evening before a more widespread surge of moisture and colder air moves south. Timing for heaviest precipitation across central MT shifted a bit later. While the arrival of snow and colder temperatures is somewhat slower, overall precipitation
amounts change little. Temperatures fall into the 20s for most areas north of I90, and locally high snowfall rates lead to icy or at least snow and slush covered roadways. Northerly to easterly winds increase with the arrival of colder air, creating areas of blowing and drifting snow in exposed areas. Steady or falling temperatures possibly reach as cold as the single digits in some locations.

Heavy Snow in SOUTHERN LEWIS AND CLARK, MONTANA
From 11-APR-20 19:47:00 to 11-APR-20 19:47:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow measured 15 inches at 7 SW Helena. Previous measurement 4 inches at 9 AM. 11 inches of snow fell in 10 hours and 47 min.

Heavy Snow in SOUTHERN LEWIS AND CLARK, MONTANA
From 11-APR-20 19:45:00 to 11-APR-20 19:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Report of 13 inches from Unionville, elevation 5000 feet. Reported via facebook.

Heavy Snow in EASTERN TETON, MONTANA
From 11-APR-20 19:31:00 to 11-APR-20 19:31:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Estimated 10 inches of new snow at the base and 14 inches at 7600 feet measured 23 SW Dupuyer. reported via twitter from Teton Pass Ski Resort. Station elevation: 6235 ft.

Winter Storm in EASTERN TETON, MONTANA
From 11-APR-20 20:00:00 to 11-APR-20 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured 8.5 inches at Choteau.

Winter Storm in FERGUS, MONTANA
From 11-APR-20 16:00:00 to 11-APR-20 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured 8 inches of snow at 5 NE Hilger. Still snowing.

Winter Storm in JUDITH BASIN, MONTANA
From 11-APR-20 17:00:00 to 11-APR-20 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Co-op observer station measured 6.2 inches snow at stnm8 Stanford.

Winter Storm in EASTERN GLACIER, MONTANA
From 11-APR-20 05:44:00 to 11-APR-20 05:44:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured 6 inches at 13 ESE Browning.

Heavy Snow in SOUTHERN LEWIS AND CLARK, MONTANA
From 12-APR-20 09:46:00 to 12-APR-20 09:46:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured 17 inches at 7 SW Helena.

Heavy Snow in GALLATIN, MONTANA
From 12-APR-20 06:48:00 to 12-APR-20 06:48:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Measured 16 inches at 19 ESE Maudlow. Relayed via social media.

Winter Storm in JUDITH BASIN, MONTANA
From 12-APR-20 17:00:00 to 12-APR-20 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Co-op observer station stnm8 stanford measured 9.4 inches. Storm total snowfall from Friday through Saturday night.

Winter Storm in EASTERN PONDERA, MONTANA
From 12-APR-20 07:00:00 to 12-APR-20 07:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Storm total snow from Friday evening through Sunday morning 9 inches. Reported via facebook. Report time and location are approximated.

Winter Storm in CASCADE, MONTANA
From 12-APR-20 07:22:00 to 12-APR-20 07:22:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm total snow 7 inches at 11 SSE Ulm. Measurements ranged from 6 to 8 inches due to blowing snow.