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 Northern Areas Southern Areas Wind Speed Wind Direction Avalanche Activity Notes
Wednesday 5/2/18 .4/4" Brackett
.2/2" Shower
.2/2" Lone
.7/5" Carrot
.2/1" Madison
.2/2" Fisher
0-10 NW-NE
Tuesday 5/1/18 0.2" Brackett
1.0/8" Shower
.1/1" Lone
1.3/11" Carrot
1.3/11" Madison
0" Fisher
5-10 NE-NW

Hard rain in the valley, snow in the high mountains

Monday 4/30/18 .2/2" Brackett
0" Shower
0" Lone
0.2" Carrot
0" Madison
0.2" Fisher
5-10 SW-SE

Good freeze last night. Temps low 30s to high 20s F

Sunday 4/29/18 -0.9" Brackett
-0.5" Shower
-0.2" Lone
-0.8" Carrot
-0.9" Madison
?/R Fisher
10-15 G25-50 SE-SW

Light rain overnight, then possible freeze this morning. Fisher SNOTEL shows >1" SWE and 0" precip? webcam showed rain.

Saturday 4/28/18 -0.6" Brackett
-0.4" Shower
0" Lone
-1.0" Carrot
-0.5" Madison
0" fisher
5-15
G25-30
S-SE Large wet loose Bridgers. A couple wet slabs northern Bridgers.

high/mid-30s F and clear skies overnight, some freeze

Friday 4/27/18 -0.6" Brackett
0" Shower
0" Lone
0" Carrot
-0.2" Madison
0" Fisher
5-15 SW-SE

Slight freeze last night, clear skies and low-mid 30s F

Thursday 4/26/18 0" 0" 5-20 NW-N

Good freeze overnight

Wednesday 4/25/18 0" 0" 15-25 SW
Tuesday 4/24/18 1.0/6" Brackett
.6/5" Shower
.4/3" Lone
.5/3" Carrot
.3/2" Madison
.2/2" Fisher
5-15 E-NE
Monday 4/23/18 1.2/12" Brackett
.6/6" Shower
.9/7" Timber
.7/7" Carrot
.3/3" Madison
.4/4" Fisher
5-15 G25 NE
Sunday 4/22/18 -.5 Brackett
0" Shower
0" Big Sky
-.2 Carrot
-.1 Madison
0" Fisher
15-25 W-SW
Saturday 4/21/18 -.1 Brackett
0" Shower
0" Big Sky
-.2 Carrot
-.1 Fisher
0" Madison
10-25 W-SW

Good freeze overnight except in the Bridgers. 

Friday 4/20/18 0" 0" 5-15 N-NE
Thursday 4/19/18 -.1 Brackett
0" Shower
0" Big Sky
-.2 Carrot
-.3 Fisher
0" Madison
5-15 S-SE

Warm but cloudy today. Freeze overnight. Wet loose potential this afternoon. 

Wednesday 4/18/18 .1/1" Brackett
.2/2" Shower
.1/2" Timber
.1/1" Madison
.1/1" Fisher
0" Carrot
5-15 W-SW Large wet loose Bridger Bowl. Wet loose Cooke City. Cornice triggered slab avalanche Cooke City.

Good freeze overnight. Warm and sunny today. 

Tuesday 4/17/18 1.5/12" Bridger Ridge
.5/4" Brackett
.5/7" Big Sky
.3/3" Shower
.2/2" Carrot
.2/2" Madison
.1/1" Fisher
15-25 W-SW Natural soft slab Bridger. Natural cornice drops Bridger Ridge

12" of new snow Bridger. Big avalanche potential once it warms up. 

Monday 4/16/18 0" 0" 15-30
G 50+ Hyalite, Big Sky
SW
Sunday 4/15/18 0" Brackett
.1/1" Shower
.1/1" Lone
.1/1" Carrot
.3/2" Madison
.1/1" Fisher
10-25 SW

No freeze at Brackett Ck (34F @ 7200').

Saturday 4/14/18 .1/1" Brackett
.2/2" Shower
.1/1" Big Sky
0" Carrot
.2/2" Madison
.1/1" Fisher
15-30 W-SW Skier triggered avalanche on Saddle Peak, Bridger Range.

Avalanche Fatality Saddle Peak

Friday 4/13/18 2.5/30" Bridger
1.1/16" Shower
.7/7" Lone
14-20" Big Sky
.6/6" Carrot
.9/6" Madison
.8/6" Fisher
15-25 G30-45 NW 0700: Bridger Ski Patrol reported many large avalanches ran naturally during the night.
Near Big Sky, a large natural on NE face of Fan Mtn, likely cornice triggered.

AVALANCHE WARNING in Bridger Range

Thursday 4/12/18 .3/2" Brackett
.4/3" Shower
.4/2" Lone
.4/4" Carrot
.6 Madison
1.2/12" Fisher
15-25 G30-40 S-SW
Wednesday 4/11/18 .3/R" Brackett
.2/2" Shower
.2" Lone
.4/3" Carrot
.2" Madison
.5/5" Fisher
20-25 G40-60 SW-W
Tuesday 4/10/18 0" 0" Carrot
.1/1" Madison
.1/1" Fisher
15-25 W-SW
Monday 4/9/18 .3/3" Brackett
.5/4" Shower
.5/5" Timber
.4/4" Carrot
.1/1" Madison
.5/5" Fisher
15-25 W-NW Snowmobile triggered slide Scotch Bonnet, Cooke
Sunday 4/8/18 .4/4" Bridger
.6/3" Shower
.5/3" Lone
.5/4" Carrot
.4/2" Lionhead
.4/3" Fisher
15-25 G30-40 NW-SW

.1-.2" of rain at start of storm to ~9,000'

Lightening hit Bridger Bowl, knocked out some wx stations.

Saturday 4/7/18 .1/1" Brackett
.1/1" Shower
.1/1" Lone
.1/1" Carrot
.1/1" Madison
.1/1" Fisher
5-15 G25 W-SW
NW cooke
Friday 4/6/18 1.1"/7" Brackett
.7/7" Shower
.5/6" Timber
.6/6" Carrot
.6/6" Madison
.8/8" Fisher
10-25
20-30 Bridgers
W-SW
E in Bridgers

East wind is cold: 2F at Bridger @5am; 30F at Lionhead.

Thursday 4/5/18 1"/8" Brackett
9" Alpine
.5/6" Timber
.3/3" Shower
.3/3" Fisher
.1/1" Carrot
0" Madison
20-40 N
15-25 S
W-SW Remotely triggered slide, Bridger Range, the Throne. 18-20" deep, 200 ft. wide, failed on an ice crust, southeast facing slope.
Wednesday 4/4/18 .1/1" Brackett
.1/1" Lone
.2/2" Fisher
.1/1" Carrot
15-35 W-SW
Tuesday 4/3/18 .4/4" Bridger
.6/6" Shower
.6/10" Big Sky
.7/8" Carrot
.3/3" Madison
.6/6" Fisher
10-25 G35 W-NW
Monday 4/2/18 .8/8" Bridger
.4/4" Shower
.6/6" Big Sky
.1/1" Carrot
.1/1" Madison
1/10" Fisher
15-20 G35 W-SW Easily triggered soft slabs in the new snow.

Snow totals at 0500 forecast heavy snow to continue

Sunday 4/1/18 .2/7" Bridger
0" Lone
0" Shower
0" 5-15 G25 W-NW Natural wind slab Bridgers
Saturday 3/31/18 .1/1" Brackett
1" Bridger
.1/1" Lone
.1/1" Shower
.2/2" Fisher
.1/1" Carrot
15-30 W-NW

Calmer today

Friday 3/30/18 .2/1" Brackett
.1/1" Lone
.1/1" Shower
.1/1" Fisher
.1/1" Carrot
15-30 W-SW Natural and human triggered wind slabs, Cooke City. Small naturals Hyalite.
Thursday 3/29/18 .5/5" Shower
.4/4" Lone
.4/4" Brackett
.2/2" Fisher
0" Carrot
0" Madison
10-25 W-NW Small skier triggered wind slab Hyalite.

Fisher Creek under reported. Ben Z said there was close to a foot of fresh around the Yurt. 

Wednesday 3/28/18 .5/4" Brackett
.5/6" Shower
.5/4" Lone
.3/4" Carrot
.4/4" Black Bear
.4/4" Fisher
15-25 G40 W-NW Wind slabs triggered Big Sky and Bridger Ski Patrols. Skier triggered wind slab Argentina Bowl.
Tuesday 3/27/18 0" Bracket
.1/4" Shower
0" Lone
0" 35-45 Bridger
20-35 elsewhere
W Natural avalanches from wind-load in Bridgers; cornice fall on Blackmore and Bole up Hyalite.

Very windy in Bridgers (40-50 mph, G70 mph) at all elevations and directions.

Monday 3/26/18 0-T" Bridgers
.4/3" Shower
.1/1" Big sky
0" Carrot
-/2" Madison
.1/2" Fisher
5-15 NE-NW Natural ava on wind-loaded slope Cooke City.
Sunday 3/25/18 1.2/11" Brackett
.7/8" Shower
.7/10" Big Sky
.4/4" Carrot
.4/5" Madison
.1/2" Fisher
10-25 G30-50 S-SW Big Sky SP triggered 3-5' wind slab. Loose wet and soft slab Cooke. Natural wind slabs Saddle.

wind calm this morning

Saturday 3/24/18 0" .2-.3" SWE 15-30 G40-60 SW-S Skier triggered and natural Beehive. Storm and wind slabs reactive at Big Sky and Bridger. Skier triggered loose snow in Cooke. Cornice trigger ava in Lionhead.
Friday 3/23/18 .7/1" Alpine
.3/Rain Shower
.7/7" Big Sky
1.5/Rain Madison
1.1/7" Carrot
.7/4" Fisher
5-20 W-SW Big Sky easily triggered large wind slabs. Natural wind slabs Cooke.

Heavy rain below 8,000 ft. 

Thursday 3/22/18 2" Big Sky
2" YC
0" Shower
0" Bridger
.2/2" Carrot
.3/3" Fisher
.1/1" Madison
10-30 W-SW Natural wind slabs and wet loose, Cooke City. Large natural wet loose over the Scepter - Hyalite.
Wednesday 3/21/18 0" .1/2" Carrot
.1/2" Madison
.1/1" Fisher
15-25 W-SW Skier triggered wind slab - Hyalite
Tuesday 3/20/18 0" Bridger
3" Hyalite
.1/3" YC
.1/1" Lone
.2/2" Carrot
.2/2" Madison
.1/1" Fisher
15-20 G30 W Snowmobiler caught and injured in cornice fall in Centennials (ID).

people reported 3+" new up Hyalite

Monday 3/19/18 .1/1" Brackett
.1/3" Shower
.1/2" Timber
.1/1" Carrot
0 Madison
0 Fisher
5-15 W-NW
Sunday 3/18/18 0" Bridgers
0" Shower
T-1" Big Sky
.3/3" Carrot
.2/2" Madison
.1/1" Fisher
15-25 G30-45 E-SE yesterday
SW-S this am
skier triggered small wind slabs N. Bridgers
Saturday 3/17/18 0" .2/2" Madison 10-20 S-SE Skier triggered Hyalite. Naturals and cracking Bridgers
Friday 3/16/18 .7/7" Brackett
.4/4" Shower
.3/4" Timber YC
.3/3" Carrot
.1/1" Fisher
0" Madison
5-20 SW Natural and human triggered storm slabs Bridger Bowl. Natural wind slabs Beehive Basin.
Thursday 3/15/18 .4/4" Shower
.5/5" Timber
.5/5" Big Sky
1" Bridger
.6/6" Carrot
.2/2" Fisher
.1/1" Madison
10-20
G 30 Cooke
SW Touchy soft slabs Big Sky. Dry loose and soft slabs Bridger.

Dropping temps, no wet avalanche danger 

Wednesday 3/14/18 0" 0" 10-20 G35
30-45 Hyalite
S-SW
Tuesday 3/13/18 0" 0" 5-10 G20 SW-SE Wet loose avalanches in all ranges except Cooke. 

Temperatures reached upper 40s F in afternoon.

Monday 3/12/18 0" 0" 5-15 S-W
Many wet loose avalanches on southerly facing slopes.

Temperatures reached 40F.

Sunday 3/11/18 0" 0" 5-15 S-SW
Saturday 3/10/18 .05/T" Bridger
.1/1" Shower
.1/1" Big Sky
.1/1" Carrot
0" Madison
.6/4" Fisher
20-30 G40-60 SW Skier triggered (x2) Republic Mtn, Cooke. Human triggered cornice in Hourglass, Bridgers. Small wind slabs Bridgers

Strong wind yesterday. light to moderate this morning.

Friday 3/9/18 .1/1" Lone
2-3" Big Sky/YC
.4/4" Fisher
.2/3" Carrot
.1/1" Madison
15-30 W-SW
Thursday 3/8/18 0 .1/1" Fisher
.1/1" Madison
10-25 W-SW Snowmobile triggered Mt Jefferson, Centennial Range
Wednesday 3/7/18 0" 0" 10-15 G28 W-SW Snowmo triggered, caught S. Madison Range
Tuesday 3/6/18 .1/2" Brackett
.1/1" Shower
.2/3" Lone
.1/1" Carrot
.2/2" Madison
.2/2" Fisher
15-20 G30 W Small skier triggered in Cooke (new snow), and another near Bacon Rind (wind slab).
Monday 3/5/18 .4/4" Brackett
11" Bridger
.6/14" Big Sky
.5/6" Shower
.2/2" Carrot
T/1" Madison
.4/4" Fisher
15-25 G40 W-NW
Sunday 3/4/18 0" Brackett
1" Shower
.1/1" Big Sky
.2/2" Carrot
.4/4" Madison
.5/5" Fisher
5-15 E-NE Skier triggered near Hebgen. Dry loose and soft slabs Big Sky, Bridger, Hyalite
Saturday 3/3/18 .1/1" Shower
.1/1" Lone
.6/6'" Carrot
.7/7" Madison
.3/3" Fisher
10-25 S-SE Skier triggered wind slab Hyalite.
Friday 3/2/18 0 .3/3" Carrot
.2/2" Madison
.1/1"" Fisher
15-30
G 50 Hyalite
S-SE Small wind slabs Ernie Miller
Thursday 3/1/18 0 0 15-40 W-SW
Wednesday 2/28/18 0" .1/1" Madison 10-15 G30
W-SW

LuLu Pass Wx not reporting.

Tuesday 2/27/18 22" Bridger
.6/9" Brackett
.2/2" Shower
.1/1" Lone
10" Big Sky
4" YC
.2/2" Carrot
.6/8" Madison
.5/6" Fisher
20-25
G35
SW-W Activity was in Bridger Range
Natural avalanche: Saddle Pk, Fairy Lake
Human triggered: Wolverine Bowl

4% density snow measured at Bridger Bowl and Big Sky.

LuLu Pass Wx not reporting.

Monday 2/26/18 0" Bridger
.1/1" Shower
.1/1" Lone
.5/5" Carrot
.9/8" Madison
7" Lionhead
.7/7" Fisher
20-30 G50 SW

LuLu Pass Wx not reporting.

Sunday 2/25/18 .3/6" Brackett
8" Bridger
.1/1" Shower
.2/3" Timber
.3/9" Carrot
.3/4" Madison
.3/3" Cooke
25-30 G40-50 W-SW Skier triggered wind slab in hyalite
Saturday 2/24/18 T-1" T-1"
15-25 G30-40 WSW
Friday 2/23/18 .1/1" Lone
1" YC
0 5-20 S, SW, SE
Thursday 2/22/18 0 .2/2" Carrot
.2/2" Madison
.2/2" Fisher
10-25 W-SW skier triggered wind slabs during control at Big Sky
Wednesday 2/21/18 0-T" Timber .1/1" Beaver
T-1" West
T-1" Cooke
10-20 G 35 W-SW
SE in Cooke
Small wind slabs Blackmore. Small wind slabs during control work Big Sky.
Tuesday 2/20/18 0" 0" 15-25 W-NW (north)
N (south)
SE (Cooke)
Monday 2/19/18 .3/3" Bridger
.2/3" Timber
0" Shower
.3/3" Carrot
.7/5" Madison
.6/6" Fisher
1.1/8" BlackBear
5-15
25-30 Bridger
E-NE
S BigSky/Hyalite
Cornice triggered avalanche in Hyalite.

SNOTEL down @ 2000 yesterday

Sunday 2/18/18 .4/4" Brackett
.8/6" shower
1.0/8" Lone
1.0/7" Carrot
1.0/4" Madison
1.8/14" Fisher
20-40 G60+ SW-W Natural wind slabs Tepee Basin and Hyalite.
Saturday 2/17/18 .5/5" Brackett
.5/5" Shower
.5/8" Timber
.7/7" Fisher
.5/5" Madison
.4/4" Carrot
15-30
G 40+
W Snowmo triggered storm slabs Cooke

Storm moving in this afternoon/evening. 

Friday 2/16/18 .1/1" Brackett
.1/1" Shower
2-3" Big Sky
.1/1" Carrot
.1/1" Madison
15-35 WSW
Thursday 2/15/18 .6/7" Lone
5" YC
.4/5" Shower
.4/5" Brackett
.6/8" Fisher
.5/7" Carrot
.5/8" Madison
15-30
W-NW
Wednesday 2/14/18 0" .1/1" Carrot
.1/1" Madison
.1/1" Fisher
25-40 SW Human triggered slide Cabin Creek and Bear Basin.
Tuesday 2/13/18 0" 0" 30-35 @Bridger
15-25
W-SW
Monday 2/12/18 0" 0" 5-15
25-35 Bridger
ESE
Sunday 2/11/18 0" 0" 15-25 G45 W-SW
Saturday 2/10/18 .1/1" Brackett
3" Bridger
.3/6" Shower
.2/4" Lone
.1/1" Carrot
0" Madison
.2/2" Fisher
5-15 N-NW Skier triggered Middle Basin; Snowmo triggered Skyline Ridge; Skier triggered Frazier; Large naturals observed Cooke; Snowmo triggered and buried at Cooke.
Friday 2/9/18 .1/1" Brackett
2" Bridger
.1/1" Lone
1"/10" Cooke
.1/1" Carrot
.1/1" Madison
15-30
G 60 Timber
W Skier triggered large cornice Hourglass north of Bridger. Sled triggered Tepee. Sled triggered Crazies. Naturals Cooke. AE deep slab Big Sky

AVALANCHE WARNING Cooke City 

Thursday 2/8/18 1.4"/8" Brackett
.7/6" Bridger
.4/4" Shower
2" Big Sky
1"/10" Fisher
.2"/2" Carrot
.1/1" Madison
20-30
G 40+
W-SW Natural wind slabs Hyalite

AVALANCHE WARNING issued for Cooke City. Heavy snow in the Bridgers and Cooke. 

Wednesday 2/7/18 .4/4" Brackett
.3/3" Shower
.2/3" Lone

.2/2" Carrot
.1/1" Madison
.3/3" Fisher
25-30 in north
15 in South
G56
W Naturals on Baronette near Cooke
Tuesday 2/6/18 .7/6" Bracket
.1/1" Shower
.3/3" Lone
.1/1" Carrot
.1/1" Madison
.5/5" Fisher
10-20 G 35 W Large cornice triggered avalanche east Woody Ridge (Cooke).
Monday 2/5/18 1.1/2" Brackett
.2/2" Shower
.6/2" Lone
.8/3" Timber
.5/4" Carrot
.6/3" Madison
1.3/12" Fisher
20-30 G40-60 W Natural avalanches: Baronette (small), Peak 9595'; and Sheep Mtn (Cooke).

AVALANCHE WARNING Cooke City

Sunday 2/4/18 .1/1" Brackett
.2/2" Shower
.1/1" Lone
.2/2" Carrot
.2/2" Madison
.9/9" Fisher
25-40 G60+ W-NW Naturals on wind loaded Cooke City. Small wind slabs skier triggered Bridgers. Small wind slab Alex Lowe Peak (N. Gall).

HIGH danger wind loaded slopes Cooke City

Saturday 2/3/18 .8/6" Brackett
.4/4" Shower
.4/4" Lone
1.1/12" Fisher
.4/4" Carrot
.4/4" Madison
15-35
G 50+ Hyalite
W-NW skier triggered near Cooke

HIGH danger wind loaded slopes Cooke City 

Friday 2/2/18 .2/1" Brackett
.1/1" Shower
1" Big Sky
.3/3" Fisher
.2/2" Carrot
.1/1" Madison
15-30 W-SW Small wind slabs and soft slabs Cooke City. Wind slabs 1' thick Bridger Bowl and Big Sky control work.

Snow developing today. 

Thursday 2/1/18 .2/2" Shower
.1/1" Lone
.1/1" Carrot
.1/1" Madison
15-25
G 40 YC
W-NW small snowmobile triggered slide, Lionhead
Wednesday 1/31/18 .3/3" Brackett
5" Bridger
.4/5" Shower
.1/2" Timber
.1/2" Carrot
.1/1" Madison
.5/5" Fisher
20-25 G 45 W

Gusted from W-SW at 50-70 Tue afternoon when snow started.

Tuesday 1/30/18 0" .1/1" Madison
.1/1" Cooke
25-40 G 68
SW Cooke City: Natural avalanche on Woody Ridge and cornice triggered avalanche on Town Hill.
Monday 1/29/18 .1/1" Brackett
0" shower
.1/1" Lone
.1/1" Carrot
.1/1" Madison
2" Lionhead
.3/3" Fisher
20-30 G40 W-SW Cooke City: Skier triggered on wind-loaded slope (small: 40' wide; 12-18" deep)
Sunday 1/28/18 0" Brackett
.1/1" Shower
.1/1" Timber
.3/3" Carrot
.4/4" Madison
.6/8" Fisher
25-30 G50 WSW Remote trigger small soft slabs x2 Cooke
Saturday 1/27/18 0" Brackett
0" Shower
.05/1" Timber
0" Carrot
0" Madison
.2/2" Fisher
15-20
G30-40
WSW
Friday 1/26/18 .5/4" Brackett
4" Bridger
.3/3" Shower
.3/5" Timber
.5/7" Carrot
.3/3" Madison
.3/3" Fisher
15-35 W-NW Small wind slabs Bridger and Beehive
Thursday 1/25/18 0" 0" 15-25
G50-60 Hyalite, Cooke
S-SW Small skier triggered soft slab, Cooke City.
Wednesday 1/24/18 0" 0" Lone
.1/1" Carrot
.1/2" Lionhead
.1/2" Fisher
25-35 G50 Hyalite SW Small snowmo triggered Buck Ridge
Tuesday 1/23/18 .2/3" Brackett
4" Bridger
.2/2" Shower
.4/10" YC and Lone

.3/5" Carrot
10" LH
.3/10" Black Bear
15-30 G40 Hyalite W
Monday 1/22/18 0" 0" 20-30 SW
Sunday 1/21/18 0" 0" 10-20
G32 Lionhead
NW-N Skier triggered wind slab Throne, N. Bridgers. Natural on Abundance, Cooke.
Saturday 1/20/18 .8/8" Brackett
8" Bridger Bowl
.5/5" Shower
6" Big Sky
1.3/12" Fisher
2.0/18" Madison
.4/4" Carrot
10-20 W-NW 1. Snowmobiler buried and killed near Reas Peak in Centennial Range (outside advisory area, but similar snowpack to Lionhead).
2. Skier triggered, caught, not buried on Naya Nuki, Bridger Range.
3. Large natural avalanche on Divide Peak in N. Gallatin Range, NE aspect.
4&5. Remote trigger small wind slab in Taylor Fork (S. Madison) and Fairy Lake (Bridgers).
6. A couple naturals Pebble Creek and Baronette: YNP.

AVALANCHE WARNING Lionhead

Avalanche Fatality

Friday 1/19/18 .7/10" Bridger
.7/6" Brackett
.7/6" Shower
.5/6" Timber
.6/5" Carrot
.5/4" Madison
.4/4" Fisher
20-40 W-SW Snowmobiler triggered slide in Lionhead, 1 caught, not buried.
Thursday 1/18/18 0 0 20-40 W-SW
Wednesday 1/17/18 0" 0" 25-35 Bridgers
10-15
NW-SW
Tuesday 1/16/18 0" 0" 5-15 G20 W-SW W of Cooke, YNP: 2 large collapses, possible natural avalanche
Monday 1/15/18 0-T"
0-T"
.1/1" Fisher
10-15 G25
25-30 Cooke
NW-N
Sunday 1/14/18 .3/3" Brackett
.2/2" Alpine
.1/1" Shower
T-1" Big Sky
.1/1" Carrot
0" Madison
.2/2" Fisher
10-20 G30
30-35
Bridger
W-NW Snowmobile triggered x2 Lionhead. Naturals, collapsing, and Goat triggered near Cooke. Snowmo triggered in Sunlight Basin. Sled triggered near Ross Peak.
Saturday 1/13/18 1.4/7" Brackett
12" Alpine
.2/4" Timber
.3/3" Shower
.3/3" Carrot
.1/1" Madison
.4/4" Fisher
10-25 G35 W Remote trigger Lionhead. Collapsing Hebgen/Lionhead. Natural wind slabs Hyalite. Large Naturals Argentina/Bridger peak. Skier triggered wind slabs Bridgers. Snowmo trigger Buck. 3-5' deep naturals on Cedar Mtn. Naturals in Hayden creek.
Friday 1/12/18 .7/6" Brackett
.4/5" Alpine
4" Bridger
.2/3" Shower
.5/6" Timber
.9/10" Fisher
.7/8" Carrot
.9/8"Madison
20-40 W-SW Skier remote triggered in Dudley Creek, N. Madison. Natural avalanche on The Fin. Small collapses town hill/miller ridge.
Thursday 1/11/18 .6/6" Brackett
6" Bridger
.5/6" Timber
.8/10" Shower
.5/6" Fisher
.4/4" Madison
.2/2" Carrot
15-30 W-SW Cracking, collapsing at Lionhead. Multiple large natural wind slabs Saddle and Argentina.
Wednesday 1/10/18 .7/6" Bridger
1.3/5" Bracket
.2/2" Shower
.8/7" Lone
1.32/10" Timber
.7/7" Carrot
1.2/12" Madison
.9/9" Fisher
20-30 G40 SW-W Snowmobiler buried and killed in Centennial Range (outside advisory area, but similar snowpack to Lionhead)

AVALANCHE WARNING Lionhead

Avalanche Fatality

Tuesday 1/9/18 0" 0" 10-20 G45 SW
Monday 1/8/18 0" .2" Fisher
0" Carrot
0" Madison
10-20 WSW Widespread collapsing and cracking in Lionhead area.
Sunday 1/7/18 .4/2" Brackett
.2/2" Timber
.1/1" Shower
.2/3" Carrot
.1/1" Madison
.2/2" Fisher
10-25 G35 W-SW Large collapse low on Cinnamon Mtn (N. Madison). Shooting crack (12-15') in Cabin Creek.
Saturday 1/6/18 .1/1" Shower
.1/1" Fisher
10-20 W Large collapse in Hayden Creek, Cooke City.
Friday 1/5/18 0 0 5-20 W
Thursday 1/4/18 .1/1" Brackett
.1/1" Shower
1" Big Sky
.1/1" Fisher
.1/1" Carrot
.1/1" Madison
5-15 W-SW
Wednesday 1/3/18 0" 0" 10-25 SW-W-NW Snowmobile triggered Crown Butte. Close call.
Tuesday 1/2/18 0" 0" 10-20 in the south; 20-30 in north W 1 snowmobiler was buried and killed in an avalanche in Cabin Creek on the west side of Sage Peak. 2 skiers caught and partially buried underneath cliffs on Saddle Peak. A small wind pocket was triggered from above.

Avalanche Fatality; Bridger had strong downhill winds.

Monday 1/1/18 0" 0" 10-20 G25 W-SW
Sunday 12/31/17 .3/3" Brackett
.3/3" Shower
.2/2" Lone
0" Carrot
0" Madison
.2/2" Fisher
20-30 G50 W-NW Collapsing at Hebgen and near Cooke. Big Sky explosive triggered persistent slab.
Saturday 12/30/17 1.5/7" Brackett
.7/4" Shower
1.6/10" Timber

.6/3" Carrot
.1/1" Madison
1.6/12" Fisher
20-25 G40 SW Widespread naturals near Cooke. Skier triggered near Cooke. Natural and snowmobile triggered on Buck Ridge. YC patrol triggered 2' wind slabs, a few 6-8' hard slabs in old snow, and naturals on road cuts. BS patrol wind slabs and one in old snow.

AVALANCHE WARNING Cooke, Lionhead, S. Madison, S. Gallatin

Friday 12/29/17 .5/4" Brackett
2" Bridger
.1/1" Shower
.2/4" Timber YC
1.4/12" Fisher
.3/3" Carrot
.2/2" Madison
20-40 West Skier caught and injured W side Bridger. Snowmobilers triggered big wind slabs in Cooke. Naturals in Cooke by Zimmer, road cut, Republic ck. Snowmobile triggered and naturals in Tepee ck., S. Madison. Big sky patrol 'deep slab'. 2 skiers triggered, caught and partially buried outside Silver Gate; uninjured.

High danger on wind load, Cooke City. 

Thursday 12/28/17 .5/3" Brackett
3" Bridger
.5/7" Shower
6" Timber
1"/10" Fisher
.3/3" Carrot
.1/1" Madison
20-40 West One skier partially buried in Sheep Creek, Cooke City. Naturals Cooke City, southerly aspects, town hill. Natural near hwy 191.

High danger on wind load, Cooke City.

Wednesday 12/27/17 0" .1/1" Carrot
.1/1" Madison
.2/2" Fisher
20-35 SW Naturals in Lionhead.
Tuesday 12/26/17 .3/6" Brackett
9" Bridger
.3/7" Shower
.3/3" Lone
8" Big Sky
.3/3" Carrot
.2/3" Madison
.6/6" Fisher
20-30
G50 Timber
W-NW

5% density in north, closer to 10% in south.

Monday 12/25/17 0" 0" Carrot
.1/1" Madison
0" Fisher
5-15 G25 W-SW
NW Cooke
Cooke City: Human triggered Silver Creek and also Hayden Creek.
Sunday 12/24/17 .1/1" 0" 20-30 NW-W Skier triggered wind slabs Bridgers. Natural wind slabs Hyalite. Natural wind slab Shedhorn Mtn.
Saturday 12/23/17 .6/14" Big Sky
.5/7" Shower
.4/9" Bridger
.5/5" Carrot
.6/8" Fisher
.3/5" Madison
10-20 W-NW
Friday 12/22/17 .3/3" Brackett
5" Bridger
.3/4" Shower
6" Big Sky
.3/3" Carrot
.2/2" Fisher
.1/1" Madison
10-20 W-NW Small Natural slab near Cooke
Thursday 12/21/17 .3/3" Brackett
6" Bridger
.4/6" Shower
6" Big Sky
.7/8" Carrot
.6/7" Madison
.5/6" Fisher
10-20 W-NW Natural wind slab Sunlight Basin. Small naturals Bacon Rind
Wednesday 12/20/17 .2/1" Bracket
0" Shower
.2/2" Lone
0" BB/BS
.5/5" Carrot
.6/5" Madison
1.1/12" Fisher
20-35 G60 SW Lots of cracking/collapsing Cooke City.

@ 0600.

Tuesday 12/19/17 0" 0" Carrot
0" Madison
.2/2" Cooke City
in north
25-40
in south
10-25
W-SW
Monday 12/18/17 0" 0" Carrot
.1/1" Madison
.1/2" Cooke
north 25-40
south 15-25
W-SW Evidence of natural avalanche on Mt. Blackmore (N. Ridge, wind-loaded); small cornice triggered slide on Beehive/Middle Basin ridge.
Sunday 12/17/17 .2/4" Brackett
.4/10" Shower
.2/3" Lone
5" Bridger
.2/3" Carrot
.1/1" Madison
.1/1" Fisher
North
25-40
South
10-20
W-NW Skier triggered wind slabs in Bridgers and Hyalite
Saturday 12/16/17 .1/1" Brackett
.1/1" Shower
2" Bridger Bowl
3" Big Sky
.1/1" Carrot
.1/1" Madison
.2/2" Fisher
5-15 W
Friday 12/15/17 0" 0" 15-25 G40 WNW
SW TFork
/Lionhead
Skier triggered wind slab Beehive
Thursday 12/14/17 .2/2" Shower
.1/1" Brackett
2" Bridger Bowl
2" Big Sky
.1/1" Fisher
.1/1" Madison
10-20 W-NW 6-12" wind slabs triggered by Bridger patrol, Skier triggered wind slab on Football Field
Wednesday 12/13/17 0" 0" 20-30
G45 Cooke
W-NW
Tuesday 12/12/17 0" 0" 10-15 G25 W

Inversion: At 5 a.m. above freezing temps (35-38F) at ridgetops (excluding West Yell and Cooke).

Monday 12/11/17 0" 0" 15-25 north
5-15 south
W-NW
Sunday 12/10/17 0" 0" 15-25
G35
NW-W

Highs around 40 F yesterday

Saturday 12/9/17 0" 0" 10-30 W-NW
Friday 12/8/17 0" .1/1" Fisher 15-30
W, NW, SW Wind slabs triggered during control work Bridger Bowl

Wind gusts reached close to 50 mph around Cooke.

Thursday 12/7/17 0" .2/2" Fisher
.1/1" Carrot
10-25 W-NW BBSP triggered wind slabs during control work.
Wednesday 12/6/17 0" 0" 15-25 W-NW Bridger Bowl Ski Patrol triggered numerous slides during control work.

Winds were steady 35 mph from all directions in the Bridgers yesterday; lots of unusual loading.

Tuesday 12/5/17 .2/2" Brackett
5" Bridger
.2/3" Shower
2" YC
0" 40-50 Bridgers
15-25
W-SW Wind slabs ski cut by BBSP

Temps in low single digits at 5am;
Storm Totals: 14-18" Bridger and Hyalite; 10" Big Sky; 6" West Yell; 12" Cooke

Monday 12/4/17 .5/5" Brackett
10" Bridger
1.1/14" Shower
.5/7" Lone
.3/4" Carrot
.5/6" Madison
.9/6" Black Bear
.7/7" Fisher
10-15 G25
25-30 G50 Cooke
NW-W
Sunday 12/3/17 0" .2/2" Carrot
1" Lionhead
.3/3" Fisher
15-25
G45
SW
Saturday 12/2/17 0" 0" Carrot
0" Madison
.2/2" Fisher
10-20 G30 SW-W
Friday 12/1/17 0" .2/2" Carrot
.1/1" Fisher
10-25 West
Thursday 11/30/17 0" 0" 10-20 West Massive avalanche on the N. Summit Snowfield at Big Sky during control work. 10' crown, ran full path. 
Wednesday 11/29/17 .4/4" Brackett
4" Bridger Bowl
2" YC
.1/1" Shower
.2/2" Carrot
.1/1" Madison
.4/4" Fisher
25-40 G 70 Cooke W-S Skier triggered wind slab Cooke City
Tuesday 11/28/17 .3/3" Bracket
.7/7" Shower
.7/6" Timber
.6/4" Carrot
.6/4" Madison
.6/5" Fisher
15-30 G45 W Skier triggered wind slab in Hyalite.

Storm totals of 3" Bridger's, 6"-8" elsewhere. Overnight lows of 10F.

Monday 11/27/17 .2/R" Brackett
0" Lone
.1/1" Shower
.4/3" Carrot
.1/1" Madison
.1/1" Fisher
25-30
G60
SW
S Cooke

Precip. @ 0500

Sunday 11/26/17 0"
T" Big Sky
0-T"
1" Lionhead
10-20 G40 W-SW

Freezing level above 9,000' at 0400

Saturday 11/25/17 0" 0" 15-25 W-SW
Friday 11/24/17 .3/2" Timber
.3/Rain Shower
.2/Rain Brackett
.1/Rain Carrot
.1/Rain Fisher
-.2 Madison
20-50 West

Bridger Bowl won't be opening due to loss of snow. 

Thursday 11/23/17 0" 0" Carrot
0" Madison
.1/0" Fisher
20-30 G47 W-SW Wet slide beehive, Slab avalanches in Cooke

Freezing level at 0600 near 10,000'.

Wednesday 11/22/17 .5/0" Brackett
.1/1" Shower
.1/1" Timber
.2/2" Carrot
.1/1" Madison
.2/2" Fisher
15-30 G44 W-SW

Temps above freezing @ 8,500'

Tuesday 11/21/17 Brackett .7/4"
Shower .2/1"
Timber 5"
Carrot .7/5"
Madison .4/3"
Fisher 1.0/7"
20-30 G55 W
Monday 11/20/17 0" Bridger
0" Shower
.2/2" Timber
0" 35-45 G 56
SW

Temps: mid 20's in N; high teens in S

Sunday 11/19/17 0" 0" 20-30 G40 W
Saturday 11/18/17 .1/1" Brackett
.1/2" Shower
.1/2" Lone
.2/2" Carrot
0" Madison
.1/1" Fisher
15-30 G45 SW
SW-NW Cooke
Friday 11/17/17 .2/2" Shower
.2/2" Lone
.2/2" Timber
0 Bridger
1.5"/10" Carrot
.9"/8" Madison
1.0"/8" Fisher
15-30 mph W-SW Large natural on east side of Abundance in Cooke

Temps were warm during the storm, hovering right around freezing. Lots of water down south with high density snow.  

Thursday 11/16/17 0" Brackett
0" Shower
.1/1" Lone
.6/4" Carrot
.6/4" Madison
.5/5" Fisher
15-30 G50 S-SW Natural cornice failure triggered small slab avalanche, Beehive Basin.

weather @ 0700

Wednesday 11/15/17 0" 0" 15-25 G35
G44 Lulu
W-SW
Tuesday 11/14/17 .2/2" Alpine
4" Bridger
.3/6" Lone
.3/6" Timber
.3/5" Shower
.2/2" Carrot
.2/2" Fisher
.3/3" Madison
15-30 West

Wind gusts around Cooke City were in the 40s. 

Monday 11/13/17 0" 0" 20-40 G45 W-SW

Very strong winds from the W-SW, transporting lots of snow. 

Sunday 11/12/17 .1/1" Brackett
.3/3" Shower
.4/3" Lone
.1/1" Carrot
.2/2" Madison
.4/4" Fisher
15-30 W-SW

Most snow fell yesterday morning.

Saturday 11/11/17 .8/8" Brackett
.1/1" Shower
.3/5" Lone
.3/2" Carrot
.5/5" Madison
.6/6" Fisher
10-20 G30 W-SW
Friday 11/10/17 0" Brackett
0" Shower
.1/1" Lone
.1/1" Carrot
.1/1" Madison
.2/2" Fisher
10-20 G35-45 W-SW
Thursday 11/9/17 0" 0" 15-25 SW
Wednesday 11/8/17 0" 0" 15-25 G35 W-SW Natural avalanche on Crown Butte, Cooke City

lows around 20F

Tuesday 11/7/17 Brackett .1/1"
Shower .2/2"
Timber .2/2"
Carrot .1/1"
Madison .1/1"
Fisher .2/2"
10-20 W Natural and skier triggered wind slabs at Bridger

single digits F overnight

Monday 11/6/17 Brackett .2/2"
Shower .1/1"
Timber .07/3"
Carrot .1/1"
Madison .3/3"
Cooke .4/4"
10-15

15-20 G30 YC
W-SW
Sunday 11/5/17 Brackett .1/1"
Shower .1/1"
Timber 0"
Carrot .1/1"
Madison .6/6"
Fisher .6/10"
10-15 SW Natural wind slab on Saddle Peak.

Not all wx sites reporting on website

Saturday 11/4/17 .8/10" Bridger
1.2/10" Brackett
.5/8" Timber
.5/5" Shower
1/9" Carrot
1.2/8" Madison
1.4/6" Fisher
10-20 G30 W-SW Natural slab ava near Fairy Lake; Hyalite Peak
Friday 11/3/17 .5/2" Brackett
.2/2" Shower
.2/2" Lone
.4/3" Carrot
.2/2" Madison
1.1/10" Fisher
10-20 G35 SW
Thursday 11/2/17 .6/6" Brackett
1.4/14" Shower
.6/5" Timber
.4/6" Carrot
.2/2" Madison
.6/5" Fisher
5-15 W-SW
Wednesday 11/1/17 .8/6" Brackett
.6/6" Shower
0 Lone
0 Carrot
0 Madison
.9/8" Fisher
15-20 G30
G63 Timber
W

Recorded about 0800.

Thursday 10/26/17 .4/0" Brackett
.3/3" Shower
.4/2" Lone
.2/3" Carrot
.1/1" Madison
0 Fisher
5-10 G15
NW-NE
Monday 10/23/17 0" Brackett
.1/1" Shower
.1/1" Lone
.2/2" Carrot
.2/2" Madison
.8/5" Fisher
15-25 G30-60
G77 Hyalite
W
Sunday 10/22/17 0" Brackett
0" Shower
0" Lone
.2/2"" Carrot
.3/2" Madison
.3/3" Fisher
15-15 G30 W-SW
Saturday 10/21/17 .5/5" Bridger
.3/4" Shower
.5/5" Lone
.2/4" Carrot
.2/2" Madison
.2/2" Fisher
15-20
G30 Bridger
G40 Timber
W
Saturday 10/14/17 .1/2" Brackett
.4/6" Shower
.3/3" Lone
.4/4" Carrot
.5/3" Madison
.5/9" Cooke
10-20 W-N
Thursday 10/12/17 .2/0" Brackett
5" Bridger
.4/5" Shower
.3/2" Lone
.2/3" Carrot
.1/1" Madison
0 Fisher
15-25 W

wind-loading

Sunday 10/8/17 0 Brackett
.3/4" Shower
.3/3" Lone
.1/2" Carrot
.1/1" Madison
.2/1" Fisher
20-25 G50 SSW
Saturday 10/7/17 0 0 20-35 G62 SSW Skier fatality Imp Peak, S. Madison
Friday 10/6/17 0 0 8-12 G22 WSW
Thursday 10/5/17 .2/2 Brackett
0 Shower
0 Lone
.3/4" Carrot
.2/1" Madison
.3/3" Fisher
5-15 G 30 W-SW
Tuesday 10/3/17 .3/6" Bridger
.1/2" Shower
.1/2" Lone
.2/2" Carrot
0 Madison
.1/1" Fisher
15-20 Bridger
5-10 Timber
W Skier triggered small wind slab, Fairy Lake
Monday 10/2/17 .2/3" Bridger
.1/1" Shower
.4/6" Lone
.2/4" Carrot
.2/2" Madison
0 Fisher
10-20 NW

Temps at 5am are in the mid-20s.

Sunday 10/1/17 .3/0" Brackett
.4/3" Shower
.1/1" Lone
.1/2" Carrot
.1/1" Madison
.1/1" Fisher
20 G30 Bridger W

snow line around 9k in Bridgers

Sunday 9/24/17 .2 Brackett
0 Shower
0 Lone
0 Carrot
0 Madison
.2 Fisher
Calm NNE
Saturday 9/23/17 .5" Brackett
0 Shower
.1 Lone
.2/2" Carrot
0 Madison
.3/3" Cooke
Calm SSW
Friday 9/22/17 .6/6" Brackett
.6/4" Shower
.4/3" Lone
.6/5" Carrot
.6/4" Madison
1.7"/16" Fisher
5-15 N-NE

First day of Fall

Thursday 9/21/17 .9/6" Brackett
.4/3" Shower
.4/2" Lone
.6/3" Carrot
.8/4" Madison
.8/5" Fisher
Yes SW

24 hr precip @ 8am

Wednesday 9/20/17 .3 Brackett
.4 Shower
.3 Lone
.2 Carrot
.5 Madison
.6 Cooke
15-20 G35 S

24 hr precip @ 9am

Tuesday 9/19/17 1.4"/- Brackett
1.0/10" Shower
.9/6" Lone
1.0/7" Carrot
1.0/4" Madison
0.6/2" Fisher

24 hr precip as of 9am

Saturday 9/16/17 2.9" Brackett
1.3" Lone
1.3/4" Shower
1.7/2" Carrot
1.8/2" Madison
1.3/3" Fisher
5 G15 @ Alpine
NA Skier triggered in Tobacco Roots 9/17

First snow in mountains. 4-11" Bridger and Big Sky. 48 hour precip. totals