A major multi day storm affected all of southeast Idaho with very heavy snow, road closures, and school closings widespread.   Five day snow totals exceeded a foot in many locations with as much as three feet in some mountain locations.  Some high elevation SNOTEL sites exceeded 5 feet.  Some of the road closures by the 11th and 12th were US Route 26 from Swan Valley to Ririe, interstate 15 from Dubois to the Montana state line, US Route 20 from Ashton to the Montana state line, Idaho Route 33 from Newdale to Tetonia, and Idaho route 32 from Ashton to Tetonia.   Many Idaho school districts closed on the 13th and 14 as well.

Winter Storm in ARCO-MUD LAKE DESERT, IDAHO
From 11-JAN-20 00:00:00 to 15-JAN-20 04:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy snow combined with winds to cause extreme travel conditions across the region.  Craters of the Moon National Monument reported 16 inches of snow from the multi day storm and the snow combined with winds to cause Jefferson County School District to close on the 11th and 12th.

Winter Storm in BEAR LAKE VALLEY, IDAHO
From 11-JAN-20 01:00:00 to 15-JAN-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy snow combined with winds to cause hazardous travel in the Bear Lake Valley.   The Bern COOP site reported 21.5 inches of snow with the storm including 13 inches on the 13th.   Bear Lake School District 33 was closed due to the hazardous travel on the 14th.   Montpelier received over a foot of snow on the 13th as well.

Winter Storm in BEAR RIVER RANGE, IDAHO
From 10-JAN-20 20:00:00 to 15-JAN-20 03:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

A multi day winter storm brought significant snowfall to the Bear River Range.   Estimated snow totals at SNOTEL sites were 28 inches at Emigrant Summit and 35 inches at Franklin Basin.

Winter Storm in BIG HOLE MOUNTAINS, IDAHO
From 10-JAN-20 21:00:00 to 15-JAN-20 07:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A powerful winter storm brought heavy snow and very strong winds to the region.   A trained spotter 4 miles west of Victor recorded 17.5 inches of snow through the 13th with the storm.

Winter Storm in BEAVERHEAD-LEMHI HIGHLANDS, IDAHO
From 10-JAN-20 21:00:00 to 15-JAN-20 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A powerful winter storm combined snow with strong winds to create extremely hazardous travel conditions.   Interstate 15 closed from Dubois north to the Montana border on the 12th through the 14th before reopening on the 14th.   Snowfall total at Dubois through the period was only 6 inches but the winds made snow removal nearly impossible for road crews.  The snowfall total at Small was 10 inches including 8 inches on the 11th.

Winter Storm in BIG LOST HIGHLANDS-COPPER BASIN, IDAHO
From 10-JAN-20 21:00:00 to 15-JAN-20 13:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

A multi day powerful winter storm brought extremely heavy snow to the region.   Estimated SNOTEL amounts over the period were the following:  Bear Canyon 28 inches, Garfield Ranger Station 39 inches, Smiley Mountain 44 inches, Stickney Mill 23 inches, and Swede Peak 29 inches.

Winter Storm in BLACKFOOT MOUNTAINS, IDAHO
From 11-JAN-20 00:00:00 to 15-JAN-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A long lasting winter storm dumped heavy snow and combined with high winds to make travel very difficult for nearly a week.   The COOP observer in Bone recorded 12 inches of snow including 8 inches on the 12th-14th.  An estimated 25 inches fell at the Sheep Mountain SNOTEL site.

Winter Storm in CARIBOU RANGE, IDAHO
From 10-JAN-20 22:00:00 to 15-JAN-20 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

A long lasting winter storm brought very heavy snow to the Caribou Range.   SNOTEL snow estimates were 21 inches at Giveout, 25 inches at Slug Creek Divide, and 18 inches at Somsen Ranch.

Winter Storm in FRANK CHURCH WILDERNESS, IDAHO
From 10-JAN-20 21:00:00 to 15-JAN-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Very heavy snow fell during this long lasting Pacific storm.   31 inches fell at the Mill Creek Summit SNOTEL site.

Winter Storm in LOST RIVER RANGE, IDAHO
From 10-JAN-20 20:00:00 to 15-JAN-20 07:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Very heavy snow fell over an extended period of time in the Lost River Range.  The Hilts Creek SNOTEL snowfall estimate for the storm was 28 inches.

Winter Storm in LOWER SNAKE RIVER PLAIN, IDAHO
From 11-JAN-20 04:00:00 to 15-JAN-20 02:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A prolonged winter storm with snow and strong winds affected the Lower Snake Plain from the 11th through the 15th.   Although snow amounts were not extreme, the combination of wind with the snow caused extremely hazardous travel conditions.   The following schools were closed on both the 13th and 14th:  Aberdeen district 58, Blackfoot district 55, Firth district 59, Shelley district 60, and Snake River district 52.   9 inches of snow fell in Aberdeen through the storm's duration with 5 inches in American Falls, and 4.5 inches in Pocatello.

Winter Storm in MARSH AND ARBON HIGHLANDS, IDAHO
From 10-JAN-20 22:00:00 to 15-JAN-20 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

A long lasting winter storm dropped heavy snow and very hazardous travel conditions to the Marsh and Arbon Highlands.  18 inches of snow fell in Inkom with 5 inches in Downey and 9 inches in McCammon.   The Sedgwick Peak SNOTEL received an estimated 21 inches and the Wildhorse Divide SNOTEL an estimated 22 inches.   The Marsh Valley School District 21 was closed on the 14th.

Winter Storm in SAWTOOTH-STANLEY BASIN, IDAHO
From 10-JAN-20 21:00:00 to 15-JAN-20 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A long lasting winter storm brought extremely heavy snow to the region.   An incredible 78 inches of snow was estimated at the Vienna Mine SNOTEL site at 9 thousand feet.   The Stanley COOP site recorded 18 inches of snow.

Winter Storm in SHOSHONE-LAVA BEDS, IDAHO
From 11-JAN-20 00:00:00 to 15-JAN-20 01:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A strong Pacific storm persisted for several days and the Richfield COOP observer recorded 12 inches of snow including 8 inches on the 13th and 14th.

Winter Storm in SOUTHERN HILLS-ALBION MOUNTAINS, IDAHO
From 10-JAN-20 21:00:00 to 15-JAN-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The multi day storm system dropped an estimated 32 inches at the Bostetter Ranger Station SNOTEL  and an estimated 41 inches at the Howell Canyon SNOTEL.

Winter Storm in SUN VALLEY REGION, IDAHO
From 10-JAN-20 21:00:00 to 15-JAN-20 04:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A multi day snow storm brought 13 inches of snow to Ketchum with the following estimated SNOTEL amounts:  Chocolate Gulch 36 inches, Dollarhide Summit 39 inches, Galena 31 inches, Galena Summit 40 inches, Hyndman 20 inches, and Lost Wood Divide 33 inches.

Winter Storm in TETON VALLEY, IDAHO
From 10-JAN-20 20:00:00 to 15-JAN-20 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A multiple day winter storm with heavy snow and high winds shut down many roads in the Teton Valley.   12 to 20 inches fell in the Victor area for the duration of the storm.   Strong winds caused extensive blowing and drifting snow on roadways and made them impossible to clear.  Idaho 32 closed from Tetonia to Ashton on the 11th through the 14th.  Idaho 33 closed from Tetonia and Newdale.   US 20 closed from Ashton to the Montana border.  Fremont County School District 215, Madison School district 321, and Teton School District 401 were closed from the 13th through the 15th.

Winter Storm in UPPER SNAKE RIVER PLAIN, IDAHO
From 11-JAN-20 00:00:00 to 15-JAN-20 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A multi day storm brought heavy snow and strong winds which shut down schools and roads in the Upper Snake River Plain.   Storm  total snowfall for the duration were 11 inches at Idaho Falls, 9.5 inches at Sugar City and Rigby, and 5 inches at Saint Anthony.  Interstate 15 shut down between Idaho Falls and Roberts on the 12th through the 14th due to the very strong winds causing extensive blowing and drifting snow .  School closures on the 13th through the 15th were Bonneville Joint District 93, Idaho Falls District 91, Jefferson District 251, Madison District 321, Ririe District 252, Sugar-Salem District 322, West Jefferson District 253.

Winter Storm in WOOD RIVER FOOTHILLS, IDAHO
From 10-JAN-20 20:00:00 to 15-JAN-20 01:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Extremely heavy snowfall occurred in this long duration winter storm with Hailey, Picabo, and Bellevue all receiving between 15 and 22 inches of snow through the storm.

Winter Storm in CENTENNIAL MOUNTAINS-ISLAND PARK, IDAHO
From 10-JAN-20 20:00:00 to 15-JAN-20 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A long lasting winter storm closed roads and schools and began late on the 10th and continued to the 15th.   Some of the snow amounts over the period were 30 inches at the Island Park COOP site, 33 inches 2 miles north of Macks Inn, an estimated 58 inches at the White Elephant SNOTEL site, and 32 inches at the Crab Creek SNOTEL.  Road closures from the 11th through the 14th were US Highway 20 was shut down from Ashton to the Montana state line, ID 47 was closed from Ashton to Bear Gulch, ID Highway 87 was closed from US 20 to the Montana state line.   Fremont County Schools were closed from the 11th through the 14th due to the extreme winter weather conditions and road closures.  The heavy snow combined with strong winds caused extensive blowing and drifting snow and was the main cause for the several day road closures.