Weather and Avalanche Log

Precip and wind are taken between 4-6 a.m. and are for the previous 24 hours. Precipitation is recorded in SWE from SNOTEL and Ski Areas
SNOTEL Locations: Brackett - Bridgers; Shower - Hyalite; Lone - Big Sky; Carrot - S. Madison; Madison - W. Yellowstone; Fisher - Cooke
Ski Area SWE: Alpine - Bridger; Timber - YC

Date Map Thumb Northern Areas Southern Areas Wind Speed Wind Direction Avalanche Activity Notes
Thursday 2/25/21 0.1/2" Alpine
0.1/1" Shower
0.1/2" Lobo
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G40 in Bridgers W-SW
Wednesday 2/24/21 0.1/2" Alpine
0.1/2" Shower
0.2/3" Timber
0.1/-1" Carrot
0.1/1" Madison
0.2/2" Fisher
10-15 G25 W-SW Small natural avalanche in Beaver Creek;
Cornice triggered avalanche on Wolverine Peak;
Elephant Mountain natural avalanche, Hyalite
Tuesday 2/23/21 0.8/8" Brackett
0.1/1" Shower
0.3/2" Timber
0.2/2" Carrot
0.3/3" Madison
1.0/10" Fisher
20-30 G60-75
15 G40 Taylor/ West
W-SW Natural Wind Slab avalanches around Cooke City
Monday 2/22/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lobo
0.3/4" Carrot
0.2/3" Madison
0.1/2" Fisher
25-30 G60-70 North
10-20 G30-40 South
W-SW Natural and deep avalanche in Lone Lake Cirque
Sunday 2/21/21 0.2/2" Bridger
0.1/3" Shower
0.2/2" Lone
0.2/3" Carrot
0.0/0" Madison
0.1/2" Fisher
20-30
G40-57
15-25 south
W-SW
WNW Cooke
Saturday 2/20/21 0.2/2" Brackett
0.1/1" Shower
0.1/1" Timber
0.3/4" Carrot
0.3/3" Madison
0.4/4" Fisher
10-20
G20-30
W-SW Snowmobile triggered Avalanches (2), McAtee Basin;
Collapse on town hill near Cooke;
Natural Avalanche, Northern Madison Range;
Specimen Creek ;
Natural on Ridge North of Blackmore
Friday 2/19/21 0.1/2" Alpine
0.2/2" Shower
0.2/6" Timber
0.2/2" Carrot
0.3/3" Madison
0.1/1" Fisher
25-30 G40-50
10-15 G25 West & Cooke
S-W Whumph and small avalanche in Gallatin Canyon;
Whumph on Little Mt. Ellis;
Natural Deep Slab on A. Lowe Peak
Thursday 2/18/21 0.2/5" Alpine
0.3/5" Shower
0.3/4" Lookout
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 W-NW Natural New snow slabs, cornice falls, dry loose in south Bridgers;
Natural Avalanche South of Saddle Peak;
Snowmobile Triggered Slide on Crown Butte;
Natural avalanche below Maid of the Mist;
Natural avalanche on Blackmore east face;
Natural Deep Slab Flanders
Wednesday 2/17/21 0.7/8" Alpine
1.0/12" Shower
0.6/8" Timber
0.3/4" Carrot
0.1/1" Madison
0.1/2" Fisher
15 G25-30 W-NW

AVALANCHE WARNING for Bridger, northern Madison and northern Gallatin Ranges.

Tuesday 2/16/21 1.1/11" Brackett
0.3/4" Shower
0.5/12" Timber
0.7/8" Carrot
0.4/5" Madison
0.3/4" Fisher
10-20 G40 W (NW Cooke) Snowmobile triggered road cut in Olson Creek;
Wind Slab, Fisher Mountain
Monday 2/15/21 0.4/8" Brackett
0.2/4" Shower
0.2/2" Lobo
0.2/3" Carrot
0.2/3" Madison
0.2/3" Fisher
5-15 G30 SW-NW Collapsing Near Hebgen Lake
Sunday 2/14/21 0.0/2" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 G20
25-35 G50 Bridger
NE-SE Splitboarder triggered, caught and killed in Beehive;
Very Large, Natural Avalanches Divide Basin
Saturday 2/13/21 0.0/0" Brackett
0.2/2" Shower
0.2/2" Timber
0.1/1" Carrot
0.2/3" Madison
0.2/2" Fisher
5-15 G10-20 NW-W
E in Bridgers & Lionhead
Natural slide in Hayden Ck south of Cooke;
Wind slab avalanche north of Bridger;
Snowmobile triggered slides in Cabin Creek;
Snowmobile triggered small slides near Daisy Pass;
Natural Avalanche, West Side Woody Ridge
Friday 2/12/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.1/1" Madison
0.0/0" Fisher
10-20 G30-40 SW-NW
E in Bridgers
Small Natural Avalanche, Scotch Bonnet
Thursday 2/11/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-30 G40-50 Madisons SW-NW Remotely triggered avalanches in Portal Creek;
Snowmobile Triggered Slide on Lionhead Ridge;
Ernie Miller Ridge Naturals
Wednesday 2/10/21 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lobo
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 G40
30 G60 Taylor Fork
W
Tuesday 2/9/21 0.4/9" Alpine
0.3/6" Shower
0.1/3" Timber
0.2/4" Carrot
0.0/0" Madison
0.2/4" Fisher
10-20 G40 W-SW Natural Avalanche on Town Hill, Cooke City;
Large natural avalanche on Mt. Abundance, Cooke;
Natural avalanche on Henderson Ridge, Cooke City;
Natural avalanches on Woody Ridge
Monday 2/8/21 0.2/4" Alpine
0.6/6" Shower
0.6/6" Timber
0.4/4" Carrot
0.0/0" Madison
0.2/2" Fisher
15-25 G25-40 W-NW Remote Trigger Outside of YC;
Sheep Creek - Gully east of Miller Trees;
Small Avalanches, Ramp;
Cooke City Soft Slabs;
Many natural avalanches on Buck Ridge;
Many Natural Avalanches - Muddy Creek;
Natural Avalanches on Cedar mountain;
Natural, North Face Alex Lowe;
Middle Basin Avalanches
Sunday 2/7/21 0.5/6" Brackett
0.5/6" Shower
0.9/16" Timber
0.8/8" Carrot
0.5/5" Black Bear
1.0/10" Fisher
15-25 G35-55
G69 Taylor Fork
W-NW Skier triggered test slope (and collapses) Beehive ;
Natural avalanahce (and collapsing) Specimen Creek;
Natural avalanche in Y-couloir west side Bridgers;
Natural avalanche on Cedar Mtn.;
Large explosive triggered, and naturals on road cuts, at Y.C. ;
Natural new snow slabs in YNP near Cooke;
Dudley Creek;
Widespread Cracking on Mt Ellis;
Natural Avalanches, Yellow Mountain ;
Multiple avalanche on Skyline Ridge;
Natural Avalanche on Lionhead Ridge;
Natural avalanche in Beehive Basin

AVALANCHE WARNING for Bridgers, Madisons, Gallatins, Cooke City

(snow totals @0600)

Saturday 2/6/21 1.1/12" Alpine
0.8/8" Shower
0.4/7" Timber
0.5/6" Beaver
0.4/4" Black Bear
0.7/6" Fisher
20-30 G50-60 W-NW Collapses and small remote triggered avalanche specimen crk ;
Whumphing and small dry loose slides near Ross Peak;
Snowmobile triggered near Lionhead;
Skier remote triggered small slab, N. Bridgers;
Natural avalanches along Bridger Ridge;
Natural Avalanches West of Cooke City
Friday 2/5/21 1.0/12" Alpine
0.6/8" Shower
0.3/7" Timber
0.4/4" Carrot
0.5/8" Black Bear
0.3/3" Fisher
15-20 G30-35
G45 Hyalite
W-NW Skier triggered and partially buried on Woody Ridge;
Whumpfs and cracks in Specimen Creek;
Natural avalanche near Fairy Lake;
Whumpfs at Bacon Rind;
Large natural avalanche in Divide cirque;
Large Natural avalanches on Saddle Peak and Truman Gulch;
Natural below Maid of the Mist;
Small Natural Avalanches north of Bridger;
Skier triggered slide from cornice, Cooke

AVALANCHE WARNING for Bridgers

Thursday 2/4/21 0.3/5" Brackett
0.5/6" Shower
0.2/3" Lone
0.1/1" Carrot
0.3/3" Madison
0.4/5" Fisher
15-20 G 40 W-NW
Wednesday 2/3/21 0.5/6" Brackett
0.5/6" Shower
0.3/5" Timber
0.3/3" Carrot
0.4/4" Madison
0.3/3" Fisher
10-20 G40 W-SW Small natural slide on Saddle Peak
Tuesday 2/2/21 0.0/0" Bridger
0.0/0" Shower
0.0/0" Lobo
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 G45 SW Several large whumpfs on way to Fawn Pass, YNP
Monday 2/1/21 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G40
5-10 G30 West & Cooke
S-W Snowmobiler triggered avalanche, Lionhead
Sunday 1/31/21 0.3/3" Bridger
0.2/3" Shower
0.3/4" Lookout
0.2/3" Carrot
0.1/4" Madison
0.3/4" Fisher
10-15
G15-25
W-SW
Saturday 1/30/21 0.4/4" Brackett
0.3/4" Shower
0.3/6" Timber
0.9/9" Carrot
0.7/7" Madison
0.3/4" Fisher
5-15
G15-20
SW-W-NW Natural Avalanches in Beehive;
Large natural sluffs in Flanders/Hyalite;
Widespread, large collapses shaking trees in S. Gallatin;
Skiers remote triggered very large slide Ernest Miller Ridge;
Natural avalanche in Maid of the Mist;
Avalanche on Yellow Mountain ;
Natural avalanches near Cooke City;
many small remote triggered slabs near Cooke;
Natural and snowmobile triggered avalanches in Taylor Fork;
Natural avalanche on Woodward Mountain;
Natural Avalanche, Fin;
Major avalanche cycle;
Meldrum Peak Natural Avalanche

AVALANCHE WARNING for the Centennials

Friday 1/29/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.7/7" Carrot
0.6/6" Madison
0.2/2" Fisher
10-20 G50 S-W Skier triggered slides N. Madison;
Whumphing and natural avalanches at Taylor Fork

AVALANCHE WARNING for the Centennials

Thursday 1/28/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.5/10" Carrot
0.3/6" Madison
0.1/2" Fisher
15-30 G50 S-SW Large Collapses in S. Gallatin

@0500

Wednesday 1/27/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.1/1" Madison
0.0/0" Fisher
10-25 G30
G50 Hyalite
SW
Tuesday 1/26/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 G15
G40 Bridger Range
E-SW

East winds are shifting back to the southwest

Monday 1/25/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.1/1" Madison
0.0/0" Fisher
5-10 G15 SW-SE
Sunday 1/24/21 0.0/0" Bridger
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-20 G15-25 W-SW Snowmobile Triggered Avalanche, Sunlight Basin
Saturday 1/23/21 0.0/0" Brackett
0.0/0" Shower
0.0/1" Lookout
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 G18 W-NW-NE Snowmobiler caught and uninjured in avalanche, Cooke City;
Loose Dry Avalanches on the Throne
Friday 1/22/21 0.2/2" Brackett
0.1/1" Lick Creek
0.1/1" Lone
0.1/2" Carrot
0.2/2" Madison
0.2/3" Fisher
5-15 SW (NW in Cooke) Snowmobile triggered on Sheep Mtn, Cooke;
Natural Avalanche Ernie Miller Ridge
Thursday 1/21/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Lionhead
0.0/0" Fisher
10-20 G30 SW-NW
Wednesday 1/20/21 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G50
G60 Bridger
SW-NW Natural avalanches near Maid of the Mist;
Natural avalanches near Lionhead Ridge
Tuesday 1/19/21 0.3/3" Bridger
0.2/3" Shower
0.2/2" Lobo
0.1/1" Carrot
0.1/1" Madison
0.2/3" Fisher
5-15 G30
G40 Cooke
W-NE Loose Snow and Slab Avalanche, Mt Blackmore;
Skier and Snowmobile Triggered Avalanches, Cooke City;
Snowmobile Triggered Avalanche, Sheep Creek;
Cracking and Collapsing, Cooke City;
Snowmobiler triggered avalanche in Tepee Basin
Monday 1/18/21 0.3/1" Brackett
0.5/5" Shower
0.1/1" Lone
0.1/1" Carrot
0.1/2" Madison
0.4/4" Fisher
15-25
G25-60
NW Snowmobile Triggered Avalanche, Second Yellowmule

@0400

Sunday 1/17/21 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-20
G30-40
W-NW
Saturday 1/16/21 0.5/4" Alpine
0.3/3" Shower
0.2/2" Lone
0.2/2" Carrot
0.2/2" Madison
0.1/1" Fisher
10-15
G25-30
NW-W Ski cut small slide on surface hoar;
Shooting cracks near Cooke City
Friday 1/15/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
20-25 G35 (50 Bridger) W-NW Collapse/Crack on Scotch Bonnet
Thursday 1/14/21 0.2/2" Brackett
0.2/2" Shower
0.2/2" Timber
0.3/3" Carrot
0.4/4" Lionhead
0.9/10" Fisher
15-20 G40-50 W
Wednesday 1/13/21 0.1/1" Brackett
0.1/1" Shower
0.2/3" Timber
0.4/5" Carrot
0.3/3" Madison
0.3/3" Fisher
25-30 G50
5-10 G25 West and Cooke
SW Lionhead Ridge natural avalanche;
Near Mt. Wilson -- shooting cracks, whumpfing;
Natural avalanches on West side of Bridgers;
Collapsing, cacking, whumpfs in S. Gallatin;
Natural avalanche south of Cooke;
Small, natural avalanches outside Cooke City;
Natural Avalanche in the S. Gallatin Range;
Natural Avalanches, Taylor Fork

W-NW wind hitting ~80+ mph across forecast area.

Buried a surface hoar layer.

Tuesday 1/12/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G40
5 G15 West and Cooke
SW-NW
Monday 1/11/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 G25-30 NW-SW Football Field Avalanche
Sunday 1/10/21 0.0/0" Bridger
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-15 G15-25 W-SW Widespread Collapsing on Ernest Miller Ridge;
Whumphing and old avalanche at Bacon Rind;
Couple large collapses in Hyalite Creek
Saturday 1/9/21 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15
G20 Bridgers
NE-N
W in Bridgers
Skier triggered large slide on Flanders Mountain;
Collapses and Whumph in N. Madison;
Cracking and Collapsing at Hebgen Lake;
Avalanche in Goose Crk near Cooke;
Sledder triggered slide and 2 naturals in Centennials;
collapse at Blackmore;
Natural avalanche and wide cracks at Buck Ridge;
Skiers triggered small slab on lower Republic Mountain;
Skier triggered slide north of Cooke;
Small natural south of Cooke;
Many snowmobile triggered slides at Lionhead
Friday 1/8/21 0.6/7" Bridger
0.3/3" Shower
0.2/4" Timber
0.1/1" Carrot
0.1/1" Madison
0.1/1" Fisher
5-15
G25 Bridgers
W-NW Skier triggered, caught and injured on The Fin;
Many whumpfs/Collapses in N. Madison;
Remote triggered slide Cinnamon Creek;
Skier Triggered Avalanche near Meridian Peak;
Remotely triggered cracking in Bridgers
Thursday 1/7/21 0.1/1" Bridger
0.0/0" Shower
0.1/2" Timber
0.1/1" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 G30 SW Natural avalanche near Fairy Lake;
Snowmobile triggered slides (2) on Buck Ridge;
Rider triggered large, wide slide on Buck Ridge;
Small Natural Avalanche NW of Cooke
Wednesday 1/6/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.1/1" Madison
0.1/1" Fisher
15-20 G35 W-SW Intentional cornice drop triggered a soft slab, Republic Mtn;
Cracking and small natural slides in S. Gallatin;
Skier triggered avalanche in Bradley's Meadow;
Skier remotely triggered avalanche in N. Madisons;
Cracking and collapsing around Lionhead;
Whumphing and cracking, West side Bridger;
Remotely triggered avalanche on Bald Mountain, Jardine, MT;
Many natural avalanches north of Cooke City;
Snowmobiler triggered avalanche on Buck Ridge;
Many (6) natural avalanches near Buck Ridge
Tuesday 1/5/21 0.8/9" Brackett
0.4/4" Shower
0.6/9" Timber
0.7/8" Carrot
0.7/8" Madison
0.6/6" Fisher
15-30 G50 W-S Natural Avalanches on Fan Mountain;
Natural avalanche on Saddle Peak;
Avalanches triggered by groomer near Jardine;
Natural avalanches along Lionhead Ridge;
Natural Avalanche in Argentina Bowl;
Collapse and crack in Lick Creek;
Skier triggered avalanche on Henderson Mtn;
Scotch Bonnet and Sheep Basin/Wolverine Peak natural avalanches;
Collapses, cracking and a natural avalanche on Mineral Mountain;
Yellowstone National park (Chrystal Creek); cornice collapse and whumpfs;
Human triggered avalanche in AB wilderness near Paradise Valley;
Many natural avalanches seen in backcountry around Big Sky;
Small natural avalanche on Buck Ridge;
Small natural avalanches along Gallatin River;
Upper Sage Creek Ridgeline;
Natural avalanches on Middle Basin Peak

AVALANCHE WARNING for Bridgers, S. Gallatin, S. Madison, Lionhead and Centennials.

Monday 1/4/21 0.1/1" Alpine
0.1/2" Shower
0.2/4" Timber
0.2/2" Carrot
0.3/3" Madison
0.3/3" Fisher
15-35
G30-40
W-SW Cornice triggered avalanche in Divide Basin, Hyalite
Sunday 1/3/21 0.2/2" Alpine
0.0/0" Shower
0.1/1" Lone
0.3/3" Carrot
0.2/2" Madison
0.2/3" Fisher
15-25
G30-50
SSW-W Natural cornice fall, collapses, Mt Blackmore ;
Ice Climber triggered avalanche in Avalanche Gulch, Hyalite;
Propagating cracks on wind drifts in Fisher Creek;
Widespread whumpfing/collapsing and cracking above Hebgen Lake;
Lots of collapsing and cracking at Bacon Rind
Saturday 1/2/21 0.1/1" Brackett
0.1/1" Shower
0.2/2" Timber
0.2/2" Carrot
0.1/1" Madison
0.1/1" Fisher
10-20 G20-25 S-W Skier remote triggered in YNP near Cooke;
Large Collapses in YNP, S. Gallatin;
Widespread whumphing near Hebgen Lake;
Skier triggered 2 wind slabs on Abiathar;
large collapse on Flanders Peak
Friday 1/1/21 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.1/1" Carrot
0.1/3" Madison
0.0/0" Fisher
10-15
G15-25
25 G40 in Bridgers
SW-NW Skier triggered large slide on Saddle Peak;
Shooting Crack and Whumpfs in Bear Basin
Thursday 12/31/20 0.6/5" Brackett
0.3/3" Shower
0.2/2" Timber
0.2/2" Carrot
0.2/2" Madison
0.1/1" Fisher
15-20 G35 W-SW
Wednesday 12/30/20 0.0/0" Bridger
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 G30 W Crown Butte, Snowmobile triggered Avalanche
Tuesday 12/29/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lobo
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-15 G25 W-NW
Monday 12/28/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lobo
0.0/0" Carrot
0.0/0" Lionhead
0.0/0" Fisher
5-15 G 25 W-N Skier Triggered Avalanche Mount Blackmore - East Face;
Loose Snow Avalanche - Flanders;
Numerous Whumphs in the Taylor Fork;
Monster Whumphs at Bacon Rind
Sunday 12/27/20 0.5/7" Alpine
0.5/6" Shower
0.5/8" Timber
0.4/4" Carrot
0.3/3" Madison
0.3/5" Fisher
5-15 G25 W-NW Collapse near Cooke below ice climb;
Whumphs in Beehive;
Three sledder triggered slides off Buck Ridge
Saturday 12/26/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-20
G35-50
SW Specimen Creek Natural Avalanche
Friday 12/25/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20
G20-40
S-W Skier Triggered Avalanche - Football Field;
Small natural activity in Beehive;
Large collapse at Maid of the Mist
Thursday 12/24/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
20-40
W-N Natural avalanches on Bridger Pk;
Collapses near Cooke City;
Naturals in YNP
Wednesday 12/23/20 0.5/6" Brackett
0.7/7" Shower
0.4/5" Timber
0.2/2" Carrot
0.1/1" Madison
0.4/4" Fisher
10-30 W-N Numerous wind slab avalanches around Cooke City
Tuesday 12/22/20 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.1/1" Carrot
0.2/2" Madison
1.0/10" Fisher
15-30 G70 S-W Natural Avalanches Barronette Peak;
Natural Avalanche Mineral Mountain;
Natural Avalanche Mt. Republic;
Skier triggered avalanche NE of Cooke City;
Natural and Skier triggered slide, YNP;
Natural Avalanche Divide Cirque
Monday 12/21/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lobo
0.1/1" Carrot
0.3/3" Madison
0.4/6" Fisher
15-30 G75 (Flanders) W-SW Colter Pass Natural Avalanche
Sunday 12/20/20 0.0/0" Brackett
0.0/0" Shower
0.1/1" Timber
0.2/2" Carrot
0.2/2" Madison
0.3/4" Fisher
20-35 G40-70 W-SW Skier triggered large cornice, Beehive;
West facing slope, Hyalite canyon ;
Astral Lake, Natural Avalanche;
Two skier triggered slides at Lionhead;
Natural Wind Slab - Overlook Mountain
Saturday 12/19/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-25 G25-50
Stronger in N
SW-W Small natural on Hyalite Peak ;
Small crowns on Barronette;
Natural Avalanche, Sunlight Basin;
Natural Wind Slab Elephant Mountain
Friday 12/18/20 0.2/2" Brackett
0.2/2" Shower
0.5/7" Timber
0.5/5" Carrot
0.3/3" Madison
0.3/3" Fisher
15-20 G30-40 W-NW Small road cut slides near West Yellowstone;
Snowplow triggered cut bank slide near Big Sky
Thursday 12/17/20 0.1/1" Brackett
0.0/0" Shower
0.1/1" Lone
0.3/3" Carrot
0.2/2" Madison
0.3/4" Fisher
20-35 G65@Hyalite W-SW Shooting cracks at Telemark Meadows;
Snowmachine triggered wind slabs near Cooke
Wednesday 12/16/20 0.1/2" Brackett
0.2/3" Shower
0.1/2" Lone
0.3/5" Carrot
0.4/6" Madison
0.2/4" Fisher
15-30 G55
1-10 G25 Cooke
W-SW Small natural avalanche at Bighorn/Fawn Pass loop;
Small, intentionally triggered slide;
Avalanches west of Cooke
Tuesday 12/15/20 0.0/0" Brackett
0.2/3" Shower
0.1/2" Lobo
0.1/2" Carrot
0.1/2" Madison
0.0/0" Fisher
5-15 G 20-40 SW-NW
Monday 12/14/20 0.1/1" Alpine
0.1/1" Shower
0.2/3" Lone
0.1/1" Carrot
0.2/2" Madison
0.1/1" Fisher
5-15 G15-30 W-SW
Sunday 12/13/20 0.1/3" Brackett
0.0/0" Shower
0.0/1" Lone
0.0/0" Carrot
0.0/0" Madison
0.1/1" Fisher
5-15 G25-30 W-SW Natural Loose Snow Avalanche - Divide Cirque;
Natural Loose Snow Avalanches - Beehive Basin
Saturday 12/12/20 0.2/3" Bridger
0.1/4" Shower
0.1/2" Timber
0.1/2" Carrot
0.1/4" Lionhead
0.1/2" Fisher
5-10 G10-20 SW-NW Cracking drift in Bridgers;
Small dry loose Bridgers, Beehive, Cooke City
Friday 12/11/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/1" Fisher
5-10 G20
20 G30 in Bridger
S-NE
Thursday 12/10/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Lionhead
0.0/0" Fisher
5-10 W-NW Full depth facet sluffs in S. Madison
Wednesday 12/9/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Lionhead
0.0/0" Fisher
15-30 G45 W-SW
Tuesday 12/8/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 G20-40 W-SW
NW-Cooke
Monday 12/7/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 G25-40 SW-W-NW
Sunday 12/6/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-20 G30 W-SW
Saturday 12/5/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-15 G25 W-SW-S-E-NE-N-NW
Friday 12/4/20 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 G25
20-30 G40 Bridgers
W-N
Thursday 12/3/20 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.1/1" Fisher
10-20 G15-25 W
N Cooke City
Natural wind slab at Bridger;
Small wind slabs near Cooke
Wednesday 12/2/20 0.0/0" Brackett
0.1/1" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.1/1" Fisher
5-15 G20-30 NE-E
W in Bridgers
Skier triggered avalanche at Bridger Bowl
Tuesday 12/1/20 0.4/6" Bridger
0.2/3" Shower
0.2/2" Lone
0.2/2" Carrot
0.2/2" Madison
0.2/2" Fisher
15-20 G40-50 W Small Avalanches in Bridger Range
Monday 11/30/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-25 G30-50 SW-W Facet sluffing in Beehive/Middle Basins
Sunday 11/29/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 G29 SW-NW
Saturday 11/28/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 G30 W-SW Natural slab avalanche near Cooke
Friday 11/27/20 0.1/0" Brackett
0.0/0" Shower
0.1/0" Lone
0.1/0" Carrot
0.0/0" Madison
0.1/1" Fisher
15-25 G25-30
G50 Bridger
W-SW
Thursday 11/26/20 0.4/4" Brackett
0.2/3" Shower
0.3/7" Timber
0.3/4" Carrot
0.2/4" Madison
0.3/5" Fisher
10-15 G30-45 SW-NW
Wednesday 11/25/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.1/1" Carrot
0.1/1" Madison
0.1/2" Fisher
10-20 G 25-45 W-SW
Tuesday 11/24/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 G20 Bridgers G40 W-NW
Monday 11/23/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 G20-30 SW-W
Sunday 11/22/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-25 G25-45 SW-NW
Saturday 11/21/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-15 G20-35 W-NW
Friday 11/20/20 0.1/2" Brackett
0.2/2" Shower
0.1/1" Timber
0.1/1" Carrot
0.2/1" Madison
0.3/3" Fisher
10-15 G30-40 SW-NW
Thursday 11/19/20 0.6/4" Alpine
0.2/2" Shower
0.3/3" Lone
0.7/3" Carrot
0.8/6" Madison
0.8/6" Fisher
15-20 G35-50 W-SW
Wednesday 11/18/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G45-60 S-SW
Tuesday 11/17/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.2/2" Fisher
10-20 G30-45 SW-W
Monday 11/16/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.1/1" Madison
0.2/2" Fisher
15-20 G35-60 SW-W
Sunday 11/15/20 0.0/0" Brackett
0.0/0" Shower
0.1/1" Lone
0.2/2" Carrot
0.3/3" Madison
0.2/2" Fisher
15-25 G30-50 W-SW
Saturday 11/14/20 0.2/1" Brackett
0.2/2" Shower
0.4/4" Timber
1.2/12" Carrot
1.0/10" Madison
0.8/9" Fisher
20-30
G45-75
W
Friday 11/13/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-30 G30-50 SW-W
Thursday 11/12/20 0.2/3" Brackett
0.3/4" Shower
0.1/2" Lone
0.0/0" Carrot
0.0/0" Madison
0.1/1" Fisher
15-30
G50 Bridgers
W Small skier triggered slides in Northern Bridgers
Wednesday 11/11/20 0.2/3" Brackett
0.1/1" Shower
0.1/1" Lone
0.1/1" Carrot
0.2/3" Madison
0.2/2" Fisher
10-20 G35-50 SW-W
Tuesday 11/10/20 0.1/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 G35-55 SW-NW
Monday 11/9/20 0.1/2" Alpine
0.1/2" Shower
0.2/2" Lone
0.1/1" Carrot
0.3/4" Madison
0.3/4" Fisher
10-15 G25 E-S-SW-W
W-NW Cooke
Sunday 11/8/20 0.5/4" Alpine
0.5/3" Shower
0.4/3" Lone
0.4/3" Carrot
0.3/3" Madison
0.9/9" Fisher
5-20
G25-45
ENE-E-SE-S
Saturday 11/7/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G50 S-SW
Friday 11/6/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-35 G50 SW-W
Thursday 11/5/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G30-50 W-SW
NW-Cooke
Wednesday 11/4/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G45 W-SW
Tuesday 11/3/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-15 G30 W-SW
Monday 11/2/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-15 G25 SW-W
Sunday 11/1/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 G30 W-SW
NW-Cooke
Saturday 10/31/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G30-60 W-SW Natural wind slab avalanches near Cooke
Friday 10/30/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
10-20 G40
5-15 G20 Cooke
W-SW
SW-N Cooke
Thursday 10/29/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G45
5-15 G25 Cooke City
W
W-NW Cooke City
Wednesday 10/28/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G40
G50 Bridger
W-NW
Tuesday 10/27/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-30
30-50 Bridger
W-SW
Monday 10/26/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
15-25 G35 W-NW Skier triggered wind slab at Bridger
Sunday 10/25/20 0.3/4" Brackett
0.2/3" Shower
0.1/1" Timber
0.3/3" Carrot
0.2/2" Madison
0.3/3" Fisher
10-20
35 G60 Bridger
SE-NE
Saturday 10/24/20 0.7/6" Alpine
0.4/3" Shower
0.3/3" Timber
0.6/5" Carrot
0.4/4" Madison
0.7/6" Fisher
10-25
G45
W-SW Cracking wind drifts in Cooke City
Friday 10/23/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Fisher
5-15 WSW
NW-Cooke
Avalanches and cracking in Frazier Basin;
Small avalanche on Sphinx Mountain;
Loose snow avalanches on Blackmore
Thursday 10/22/20 0.4/8" Alpine
0.3/3" Shower
0.0/2" Timber
0.0/0" Carrot
0.5/3" Madison
0.8/4" Fisher
5-15 G30 W-NW Widespread dry loose in Hyalite
Wednesday 10/21/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.9/6" Fisher
15-20 G35-40 NW-W
Tuesday 10/20/20 0.2/2" Brackett
0.7/5" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.8/6" Fisher
15-20 G 40-50 SW-NW

@0700

Monday 10/19/20 1.1/5" Brackett
1.1/5" Shower
0.3/3" Lone
0.7/4" Carrot
0.2/1" Madison
1.3/9" Fisher
10-20 G40-50 NW-W Natural avalanches near Fairy Lake
Sunday 10/18/20 0.4/3" Brackett
0.4/3" Shower
0.1/1" Lone
0.0/0" Carrot
0.0/0" Madison
0.5/4" Fisher
15-30 G50 NW-W
Saturday 10/17/20 0.2/0" Brackett
0.5/0" Shower
0.2/0" Lone
0.0/0" Carrot
0.0/0" Lionhead
1.0/4" Fisher
20-30 G50 W

Precip mostly rain overnight 10/16. Temps dropping and switching to snow on morning of 10/17.

Friday 10/16/20 0.2/2" Brackett
0.3/3" Shower
0.1/1" Lone
0.0/0" Carrot
0.0/0" Madison
0.2/2" Fisher
15-25 G40
W
NW Cooke

@0600

Thursday 10/15/20 0.2/3" Brackett
0.5/5" Shower
0.1/1" Lone
0.0/0" Carrot
0.0/0" Madison
0.2/2" Fisher
10-20 G30-40 W-NW

@0600

Wednesday 10/14/20 0.9/0" Brackett
0.7/0" Shower
0.5/0" Timber
0.2/0" Carrot
0.2/0" Madison
1.6/3" Fisher
30-40 G50-70
G80 Hyalite
W

Precip mostly rain evening 10/13, some wet snow high near Cooke.

Tuesday 10/13/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.1/1" Fisher
15-30 W-SW
Monday 10/12/20 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.2/2" Fisher
20-50 W-SW
Sunday 10/11/20 0.6/0" Brackett
0.7/1" Shower
0.6/0" Lone
0.6/1" Carrot
0.7/0" Madison
0.7/6" Fisher

@1pm: Measurements are Preciptation (inches) instead of SWE. Lower elevations had rain, and snow depths varied from 0-6".