Weather and Avalanche Log

Date Map Thumb Northern Areas Southern Areas Wind Speed Wind Direction Avalanche Activity Notes
Tuesday 12/24/24 0.1/1" Alpine
0.1/1" Shower
0.1/1" Lone
0.0/0" Carrot
0.0/0" Madison
0.1/1" Sawtelle
0.1/1" Fisher
10-20 G35
5 G15 in Cooke
S-W
NW Cooke
Monday 12/23/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.2/2" Fisher
10-25
G25-45
W-SW
NW Cooke
Sunday 12/22/24 0.1/1" Alpine
0.2/2" Shower
0.2/2" Lone
0.1/1" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.2/2" Fisher
10-30
G40-55
SW-W
Saturday 12/21/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
10-20 G25-40 SW-NW Snowmobiler triggered wind slab on Buck Ridge
Friday 12/20/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
15-25 G30-50
10 G20 in Cooke
S-W-NW
Thursday 12/19/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.5/0" Fisher
25-40
G80
W E Face Mount Fox avalanche ;
Natural avalanche on Fan Mountain;
Cornice triggered avalanche in Hourglass chute

Snow was falling in Cooke yesterday, but with wind hard to measure how much

Sawtell rimed again

Wednesday 12/18/24 0.1/1" Brackett
0.2/2" Shower
0.1/1" Timber
0.2/2" Carrot
0.1/1" Madison
0.1/2" Wt Elephant
0.2/2" Fisher
15-35 G55
10 G25 Cooke
SW-NW Small windslab along Beehive Ridge;
Wind Slabs near Cooke City;
Skier triggered wind slab in Frazier Basin;
Natural avalanche, Saddle Peak;
Wind slab avalanches in Naya Nuki Bowl ;
Natural Avalanche on Arden Peak;
Natural Avalanche Activity, Cooke City
Tuesday 12/17/24 0.6/5" Brackett
0.2/2" Shower
0.6/12" Timber
0.7/7" Carrot
0.4/4" Madison
0.5/5" Wt Elephant
0.5/5" Fisher
10-20 G40 NW-SW Wind/storm slab avalanche in the Bridger Range;
Remotely triggered slide near Buck Ridge;
Widespread weak layer Island Park;
Collapsing on West Henderson;
Terrain trap avalanche in Buck Ridge
Monday 12/16/24 1.0/8" Alpine
0.4/5" Shower
0.5/7" Timber
0.2/2" Carrot
0.3/3" Madison
0.3/3" Sawtelle
0.4/5" Fisher
10-20
G30-45
G54 Hyalite
W-NW-SW 2 Storm Slabs near Buck Ridge;
Natural Avalanche on the Fin
Sunday 12/15/24 0.2/2" Alpine
0.0/0" Shower
0.2/3" Timber
0.3/2" Carrot
0.5/4" Madison
0.7/6" Sawtelle
0.2/2" Fisher
10-20
G30-45
SW-W Windslab above surface hoar near W. Yellowstone/IP;
Shooting cracks in Middle Basin;
Small skier triggered wind slab in N Madisons;
Storm snow avalanche in Middle Basin ;
Large Whumph at Blackmore;
Slide South of Henderson Bench;
Skier triggered slide at The Throne;
New snow avalanche in Hyalite east fork ;
Many natural avalanches on Saddle Peak;
Skier caught and buried at Bridger;
Snowmobile triggered avalanche, Buck Ridge

@0600

Saturday 12/14/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.1/1" Fisher
20-30 G35-50
10 G25 in Cooke
S-W Wind Slab in Taylor Fork
Friday 12/13/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
10-20 G25-35
25 G50 in Hyalite
S-W
Thursday 12/12/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
15
G20-30
W
some NW & SW

Trace of snow in a few places

Wednesday 12/11/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Lionhead
0.0/0" Wt Elephant
0.0/0" Fisher
15-20
G 25-40
W and NW
Tuesday 12/10/24 0.1/3" Bridger
0.1/2" Shower
0.1/1" Lone
0.0/0" Carrot
0.1/1" Madison
0.1/1" Sawtelle
0.0/0" Fisher
5-15 G35
20 G45 Bridger Range
W-N
Monday 12/9/24 0.3/4" Bridger
0.8/10" Shower
0.2/4" Lobo
0.0/0" Carrot
0.1/1" Madison
0.1/1" Sawtelle
0.1/1" Fisher
5-15 G55 W-NW
Sunday 12/8/24 0.0/0" Brackett
0.0/0" Shower
0.2/1" Timber
0.2/2" Carrot
0.0/0" Madison
0.1/1" Sawtelle
0.2/2" Fisher
10-30
G40-60
G74 Big Sky
SW-W-NW Avalanche Hayden Creek

@0600

Saturday 12/7/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
10-25
G25-47
W-NW
Friday 12/6/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
5-15 G15-30 NW-W

Temperature Inversion - Valley temps colder than mountains

Wednesday 12/4/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
10-15 mph
G 30
NW and W
Tuesday 12/3/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
10-15
G20-35
25-30 @BigSky
W
N-NW Cooke

Temps @0400:

  • 30-34 F at 8-10k', 20s F in valleys
  • 46 F at Bridger Base
  • mid-20s near Cooke
Monday 12/2/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
5-15 G30 W-N Wet loose slides at Big Sky;
Wet Loose at Lulu Pass;
Small Wet Loose on Eglise Rock

Temps @ 0400

North: Upper 20s-31 F

South: Teens F

Sunday 12/1/24 0.1/1" Alpine
0.1/1" Shower
0.0/0" Lobo
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.1/1" Fisher
15-20 G45 Northern Ranges
5-15 G30 Southern Ranges
N-W Natural Wet Snow Avalanche, in Bridgers
Saturday 11/30/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
10-20 G25-40 NW-W Small Wind Slab Avalanches off Buck Ridge
Friday 11/29/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
15-20 G25-35
5 G15 in Cooke
NW-W Wind slab avalanche near summit of Mt Blackmore ;
Skier Triggered Avalanche near Going Home Chute
Thursday 11/28/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
5-15 G20-30 NW-W BSSP Triggered deep avalanche in Big Couloir;
Old wind slab Henderson
Wednesday 11/27/24 0.1/2" Brackett
0.2/2" Shower
0.3/6" Timber
0.2/2" Carrot
0.1/1" Madison
0.1/1" Wt Elephant
0.2/2" Fisher
5-15
G15-35
W-NW
SW yesterday
Loose Snow Avalanches Mt Blackmore
Tuesday 11/26/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.1/1" Fisher
15-25 G45 SW-NW BSSP triggered avalanches on facets and wind slabs
Monday 11/25/24 0.1/2" Brackett
0.3/3" Shower
0.1/2" Lone
0.1/1" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.3/3" Fisher
5-10
G 15-20
Increase late Sun night
& Mon AM
W Natural Avalanches on Saddle Peak;
Avalanches and cracking at Big Sky
Sunday 11/24/24 0.3/3" Bridger
0.5/5" Shower
0.5/5" Lone
0.6/3" Carrot
0.6/3" Madison
0.8/4" Wt Elephant
0.6/5" Fisher
10-30
G20-55
W-SW
NW IP
Saturday 11/23/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
15-30
G35-55
SW-W Cracking and wind slab formation at Bridger
Friday 11/22/24 0.1/1" Alpine
0.0/0" Shower
0.3/3" Lobo
0.5/3" Carrot
0.1/1" Madison
0.2/2" Wt Elephant
0.3/2" Fisher
25-35 G50-55
15 G30-40 Bridgers & Cooke
SW-W Localized cracking and collapsing on Mt. Henderson
Thursday 11/21/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
/
0.0/0" Fisher
30-40
G 50-60
except Bridgers and Cooke
S/SW Thin windslabs in northern Bridgers;
Wet snow avalanches in Hyalite

Warming ahead of storm system

Wednesday 11/20/24 0.3/4" Brackett
0.1/1" Shower
0.1/1" Lobo
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.1/1" Fisher
15-25 G45
except Bridgers and Cooke:
5-10 G30
SW-NW
Tuesday 11/19/24 0.6/9" Bridger
0.5/7" Shower
0.5/9" Lone
0.4/4" Carrot
0.4/4" Madison
0.5/4" Wt Elephant
0.3/3" Fisher
5-15 G35 W-N
Monday 11/18/24 0.1/1" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.1/1" Madison
0.2/2" Wt Elephant
0.3/3" Fisher
10-20
G35-55
W-SW Shooting Cracks in Beehive Basin
Sunday 11/17/24 0.0/0" Brackett
0.1/1" Shower
0.1/1" Lone
0.2/2" Carrot
0.1/1" Madison
0.2/2" Wt Elephant
0.1/3" Fisher
20-30
G 35-50
less wind in Cooke
W Wind Slab Avalanche - Northern Bridger Range
Saturday 11/16/24 0.5/4" Brackett
0.3/3" Shower
0.1/2" Lone
0.3/3" Carrot
0.1/1" Madison
0.1/2" Wt Elephant
0.0/0" Fisher
Before snow
30 G50 Bridgers
5-15/G20-30
After
7-20 G15-30

Before snow
E-SE
After
E->N->W
Small storm slabs Hidden Gully
Friday 11/15/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
10-20 G20-45 E-SE
Thursday 11/14/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
15-30
G45-65
W-SW
Wednesday 11/13/24 0.1/1" Bridger
0.2/2" Shower
0.1/1" Lone
0.3/3" Carrot
0.3/3" Madison
0.2/3" Wt Elephant
0.2/3" Fisher
10-20
G20-35
NW-SW
Tuesday 11/12/24 0.3/3" Brackett
0.2/2" Shower
0.1/1" Lone
0.1/1" Carrot
0.0/0" Madison
0.1/0" Wt Elephant
0.0/0" Fisher
5-20
G30-45
W-SW

@0600

Monday 11/11/24 0.1/0" Brackett
0.0/0" Shower
0.1/1" Lone
0.0/0" Carrot
0.1/0" Madison
0.0/0" Wt Elephant
0.2/2" Fisher
10-20
G30-40
W-SW

Rain up to 7500-8000'? last night.

Sunday 11/10/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
10-15
G25-37
W
Saturday 11/9/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
5-15 G25 N-NW
Friday 11/8/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
5-15 G25
25-35 Bridgers
N-NE
W Bridgers
Thursday 11/7/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
15-30 G40 W-N Natural Avalanche Bridger Bowl
Wednesday 11/6/24 1.0/15" Bridger
0.7/10" Shower
0.4/4" Lone
0.1/1" Carrot
0.1/1" Madison
0.0/0" Wt Elephant
0.1/1" Fisher
10-25 G45 W-N Skier-triggered avalanche in Super Couloir;
Small natural avalanches below ridge South of saddle peak;
Whumphing and cracks below the Apron;
Natural Avalanche near Fairy Lake
Tuesday 11/5/24 0.2/2" Alpine
0.2/2" Shower
0.3/4" Timber
0.4/4" Carrot
0.3/4" Madison
0.4/4" Wt Elephant
0.2/2" Fisher
10-25 G60 W-N
Monday 11/4/24 0.1/1" Alpine
0.1/1" Shower
0.0/0" Lone
0.1/1" Carrot
0.2/4" Madison
0.0/0" Sawtelle
0.1/1" Fisher
5-10 G25 W-NW Early season avalanche, outside advisory area
Sunday 11/3/24 0.5/6" Bridger
0.6/9" Shower
0.6/11" Lobo
0.6/7" Carrot
0.8/5" Madison
0.7/6" Wt Elephant
0.3/3" Fisher
10 G20
G40 Island Park
SW-W-N
Saturday 11/2/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
10-20
G30-45
S-W Climber triggered wind slabs at the Sphinx
Friday 11/1/24 0.3/3" Brackett
0.1/2" Shower
0.2/5" Timber
0.3/5" Carrot
0.6/7" Madison
0.8/8" Sawtelle
0.4/7" Fisher
5-15
G20-30
SW-W
Thursday 10/31/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
10-25
G25-40
SW-W
Wednesday 10/30/24 0.0/0" Brackett
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.1/1" Fisher
5-10
G10-25
NW-SW-S
Tuesday 10/29/24 0.1/1" Brackett
0.6/6" Shower
0.2/2" Lone
0.4/4" Carrot
0.3/3" Madison
0.5/5" Sawtelle
0.5/5" Fisher
5-20
G20-35
W-NW-N
Monday 10/28/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lobo
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
10-25 G55
G70 Lionhead
W-SW

@0700

Sunday 10/27/24 0.0/0" Bridger
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
10-25 G55 W-SW
Saturday 10/26/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
10-30 G50 W-SW
Friday 10/25/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Sawtelle
0.0/0" Fisher
5-15 G25
25 G50 Sawtelle
W-SW
Thursday 10/24/24 0.2/1" Alpine
0.2/2" Shower
0.1/1" Lobo
0.3/3" Carrot
0.2/2" Madison
0.3/4" Sawtelle
0.2/2" Fisher
10-25 G55 SW-NW
Wednesday 10/23/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
10-20 G40 W-SW
Tuesday 10/22/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
10-30 G50 W-SW
Monday 10/21/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
5-15 G35 NW-SW
Sunday 10/20/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Timber
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
5-15 G35 W-SW
Saturday 10/19/24 0.0/0" Alpine
0.0/0" Shower
0.0/0" Lone
0.0/0" Carrot
0.0/0" Madison
0.0/0" Wt Elephant
0.0/0" Fisher
5-20 G35 NW-SW
Friday 10/18/24 0.3/3" Brackett
1.2/10" Shower
0.5/5" Bavaria
0.9/8" Carrot
0.6/6" Madison
0.2/2" Wt Elephant
0.6/5" Fisher
5-20 G20-40 NW-N-NE

Started as rain at lower elevations. SWE Totals @0600 since storm/precip began late 10/16- early 10/17.