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

Day Northern Areas Southern Areas Wind Speed Wind Direction Avalanche Activity Notes
Friday 1/20/17

.2/1" Brackett
.1/1" Lone

.2/2" Fisher
.2/2" Madison
.1/1" Carrot

5-15

W-SW

Thursday 1/19/17

0

0

15-30 G 40

W-SW

Wednesday 1/18/17

0

0

20-30 G40
10-20 Cooke

W-SW
N

Did not freeze last night in Bridgers, Hyalite and lower elev at Big Sky.

Tuesday 1/17/17

0

0

30-35Bridger
10-20YC
10-15Cooke

W
W
NW

Strong mid mtn winds from S (G38) at Bridger.

Monday 1/16/17

0

0

10-15
G33 Bridger
G30 Big Sky

W-NW
N Cooke

Strong downhill and cross slope winds in Bridgers.

Sunday 1/15/17

0

0

5-15
G25-30

W-SW
N Cooke

Avalanche in Beehive Basin

Strong downhill winds Bridgers.

Saturday 1/14/17

0

0

5-20

W-SW

One observed in Sheep Creek near Cooke, possibly snowmo triggered

Friday 1/13/17

0

0

5-20

W-SW

Thursday 1/12/17

.3/2"Bracket
.2/3"Shower
.4/4-6"BigSky

.2/2"Carrot
.7/6"Madison
.6/6"Cooke

10-15 G30

W

Two small remotely triggered slides - Lionhead

Cooke City storm total: 3.5"SWE/4'snow

Wednesday 1/11/17

.1/1" Shower
.2/3" Brackett
.5/10" Timber

.8/20+" Fisher
.4/4" Carrot
.4/4" Madison

10-25

W-SW

Cooke City: many natural avalanches.

Avalanche Warning Cooke City. 3' of snow totaling 3" of SWE in 3 days.

Tuesday 1/10/17

.6/2"Bracket
.3/4"Shower
.4/2-3"BigSky

.5/4"Carrot
.7/4"Madison
.8/4"Cooke

20-40
G50+

W

Avalanche Warning in Cooke City. Inches of snow seem low compared to SWE.

Monday 1/9/17

.4/2" Brackett
.3/2" Shower
.7/5" Lone

.7/2" Carrot
.8/4" Madison
1.4/8" Fisher

25-40
G60 Hyalite
G62 BigSky
G50 Cooke

W-SW

Avalanche Warning for Cooke City

Sunday 1/8/17

.2/2" Brackett
.5/5" Lone
.1/1" Shower

.4/3" Carrot
.3/3" Madison
.4/5" Fisher

20-30
G57 Hyalite
G70 Summit

W-SW

Saturday 1/7/17

0

0

10-20 G30

W-SW

Friday 1/6/17

0

0

10-25

W-NW

Thursday 1/5/17

0

0

5-20

N-NE

Small but touchy wind slabs in the Bridger Range.

Cold!

Wednesday 1/4/17

0

0

10 G15

W

averaging -5F at 0500.

Tuesday 1/3/17

Trace-1"

Trace-1"

10-15 G20

W

-15F in north; -5 in south; inversion in north.

Monday 1/2/17

.1/2" Bridger
.1/1" Brackett
.1/1" Lone
NR Shower

.1/1-2"?
NR Fisher
NR Madison
NR Carrot

10-20 overnight
5-10 this a.m.

S-SE overnight
E-NE this a.m.

Cracking, collapsing in Bridgers (Throne and Bostwick)

Sunday 1/1/17

0

0

10-20
G48 Big Sky
G30 Cooke/Hyalite

W-NW Bridger
W-SW elsewhere

Natural observed in N. Gallatins

Saturday 12/31/16

.3/4" Brackett
.4/7" Shower

.2/2" Carrot
.1/2" Fisher

20-40 Bridger
15-30 elsewhere

W-NW Bridger
W-SW elsewhere

Friday 12/30/16

0

0

20-40 G50

W-SW

Thursday 12/29/16

0

0

10-25

W-NW

Large naturals observed on wind loaded slopes Cooke City

Wednesday 12/28/16

.1/3" Bridger
.5/12" BS&YC

.5/7-10"

20-30
G50 ski areas
G66 Hyalite

W

Wind slabs 1-2 deep triggered by Big Sky Ski Patrol.

Snow was low density powder and not all snow sensors picked up the total amounts. Verified by workers.

Tuesday 12/27/16

0

0

20-30
G48

W-SW

Monday 12/26/16

.3/4" Brackett
.3/6" Shower
.2/2" Lone
.2/8"Big Sky

.1/4" Carrot
.3/4" Madison
.2/2" Cooke

10-20
G30
30s G41 Bridger

WNW
WSW Taylor to Lionhead

Another collapse at Bacon Rind

Sunday 12/25/16

T/1" Bridger
.1/1" Lone
.1/1" Shower

.5/2" Carrot
.2/2" Madison
.4 Whiskey
0 Fisher

0-10

N-NE

Collapse at Bacon Rind

Saturday 12/24/16

.3/5" Lone
.2/2" Shower

.4/4" Madison
.3/3" Carrot
.2/2" Fisher

10-25
G40 Hyalite

W-SW

Friday 12/23/16

0

0

5-20 mph

W-NW

Thursday 12/22/16

0

0

10-20

W-SW

Wednesday 12/21/16

.2/2" Hyalite
.4/5" YC

.7/6" Carrot
.4/4" Madison
.6/5" Fisher

20-30
G60

W-NW

Cracking/collapsing near Goose Lake. A few recent natural avalanches.

Tuesday 12/20/16

0

.2-.3/2"

30-40
G60+ Lone Peak

W-SW

Cooke City: The Fin avalanched on Mt. Republic, lots of collapsing and cracking at lower elevations

Monday 12/19/16

0

Tr-.1/1"

30s north
G40-50
10-15 south
G20

W-NW

Hyalite: small wind slab avalanche at top of ice climb.
Big Sky Patrol ski cut wind slabs.

Very windy all day throughout the forecast area.

Sunday 12/18/16

0

0

20s-35
G73 Slushmans
G43 Big Sky
G29 Cooke

NW
WSW- Lionhead

Snowmobile triggered 2-5' slab north of Daisy, Cooke. A few small and one large observed in Sunlight Basin, Taylor Fork

Saturday 12/17/16

.1/1" Shower
.1/1" Brackett

.4/4" Madison
.3/3" Fisher

10-25

W-NW

Large naturals observed in Cooke

Avalanche Warning Cooke City. Very cold! -15 to -25 with -30 to -40 wind chill.

Friday 12/16/16

.6/4" Brackett
.1/2" Shower
.5/6" Timber

.9/4" Carrot
1.5/8" Madison
2.0/12" Fisher

15-20
G79 Summit
G50 Lulu
G30s Hyalite

SW-NW
N this a.m.

Large avalanches triggered during control - Big Sky.

Avalanche Warning for S. Ranges

Thursday 12/15/16

.2/3"Lone
.3/5"Timber
.1/1"Shower
.2/1"Brackett

.6/6"Madison
.7/7"Carrot
.6/6"Fisher

20-30 G50

W-SW

Multiple slides broke deep on crust at Big Sky during control work. Naturals near Bacon Rind/in YNP

Wednesday 12/14/16

0

0

15-20
G30s

W

Two naturals observed Cooke City.

Tuesday 12/13/16

.1/T-1"YC/BS

.1/1"Fisher

20-30
G40-50

W-NW

Monday 12/12/16

.0/0"Brackett
.1/1"Shower
.2/4"Timber

.2/2"Carrot
.1/2"Madison
.3/3"Fisher

15-25 G30-40
G51 Hyalite
G45 Big Sky
G35 Lulu

WNW

Collapsing/craking Frasier Basin and Cooke City; YC post control release; B Bowl cornice trigger in Mundy's

Sunday 12/11/16

.4/3"Brackett
.4/6"Alpine
.3/3"Shower
.2/3"Timber

.3/3"Carrot
.3/2"Madison
.6/4+"Fisher

10-20
G20-30 @ 0400
G50s @ 1500

WNW

Skier fatality on Henderson; Hidden Gully slid to ground >1500' long; Deep slabs at Big Sky; N. face Blackmore (natural)

Fatality in Cooke: Skier on Henderson

Saturday 12/10/16

.1Shower
.3Big Sky
.5Brackett

.7Fisher
.5Carrot
.4Madison

15-30 mph

W-SW

Snowmobiler caught, fully buried, uninjured at Buck Ridge

More snow and wind down south today.

Friday 12/9/16

.3 Lone

.5 Carrot
.4 Beaver Creek
.2 Fisher
.1 Madison

15-30
G 40 Big Sky

W-SW

North Summit Snowfield went big.

Not as cold. More snow tonight and tomorrow.

Thursday 12/8/16

0

0

5-10
G15

SW-NW

Avalanches Bridger & Big Sky during control work.

Cold! -15 at 5 a.m.

Wednesday 12/7/16

T

T

5-10

SW-W

Large ava S. Face Lone Peak
(explosive trigger)

Cold! -10F at 5 a.m.

Tuesday 12/6/16

.15/4" Bridger
.1/1" Shower

T-1"

10-15

SW
NW(Cooke)

Bridgers: Skier cut a slope that sluffed and stepped down to the facets.

Cold! 0 to -8F in mtns

Monday 12/5/16

.1/1" Brackett
.5/7" Shower
.3/3" Lone

1.0/12" Carrot
1.0/6" Madison
1.0/14" Fisher

15-25
G48 Hyalite
G58 BigSky
G48 Lionhead
G35 Cooke

WNW

Avalanche Warning: Cooke City, Lionhead, S. Gallatin, S. Madison

Sunday 12/4/16

.0/0Bridger
.0/0Shower
.1/2"BigSky

.3/3"Carrot
.2/3"Madison
.3/5"Fisher

20s G45Lone/Hyalite
G41Cooke

W-SW

skier triggered storm slab in Cooke.

Saturday 12/3/16

.1 SWE

.1 SWE

15-30 G40

W-SW

Natural Avalanche Apron, Bridger Bowl, Naturals Hyalite and YC, Naturals Saddle and Argentina bowl, Hourglass

Friday 12/2/16

.9 Shower 12"
.3 Bracket 8"
.1-.2 Big Sky 2-5"

.1 Tr-1"

5-15

W-NW

Avalanche Warning Bridger Range and Northern Gallatin Range