Weather and Avalanche Log

Date Map Thumb Northern Areas Southern Areas Wind Speed Wind Direction Avalanche Activity Notes
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

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
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.

Previous Years Weather and Avalanche Log

17-18 | 18-19 | 19-20 | 20-21 | 21-22 | 22-23 | 23-24