Trip Planning for Southern Gallatin

as of 5:00 am
Apr 302″ | NA
Apr 29 2″ | NA
Apr 28 3″ | NA
9460′     03/30 at 14:00
65.8℉
N - 0mph
Gusts 1mph
9000′   05/28 at 20:00
34℉
65″ Depth
Bottom Line: Spring weather can be highly variable and create a mix of avalanche problems to watch out for. Snow conditions and snow stability can change drastically from day to day or hour to hour. Anticipate rapid change and plan accordingly. Plenty of snowfall over the winter with more spring snow to come makes avalanches possible into summer.

Past 5 Days

Mon Apr 18

None
Fri Apr 22

None
Mon Apr 25

None
Fri Apr 29

None
Mon May 2

None

Relevant Avalanche Activity

Bridger Range
Bridger Bowl
Many natural storm snow slab avalanches at Bridger
Incident details include images
Bridger Bowl
SS-N-R2-D1.5-S
Elevation: 7,500
Coordinates: 45.8156, -110.9230
Caught: 0 ; Buried: 0

There were many similar depth, 8-12" natural crowns along the ridge that broke this morning or overnight within the recent snow that fell over the weekend.


More Avalanche Details

Relevant Photos

Displaying 1 - 40
  • From 5/21/22: "Triggered a small slide underneath the cornice of the southeast chute off of Emigrant peak. The slide was 50 ft wide,  4 inches deep, and ran for about 100 ft. The slide was not large enough to knock you off your feet (D1). The latest storm had deposited about 12 inches of new snow underneath the cornice." Photo: C. Chupik

  • Natural avalanche that occurred at Bridger early on 5/9/22. There were many similar depth natural crowns along the ridge that broke within the recent snow that fell over the weekend.

  • Crown of a natural avalanche that occurred at Bridger on 5/9/22. There were many similar depth natural crowns along the ridge that broke within the recent snow that fell over the weekend.

  • Obs 5/9/22: "found an intact graupel layer buried by 10-14” of fresh snow. Got cracking on it (ectn 17, ct 18) but no propagation. Also saw lots old of storm slabs/wind slab crowns."

  • Natural wet loose avalanche in Beehive Basin. Occurred on Wednesday 5/4 after new snow fell on Tuesday.

  • Wet loose snow avalanches of recent 6" of snow. They likely occurred when the sun came out Wednesday morning, or at the end of the storm on Tuesday. GNFAC

  • "5/3/22 at approximately 4:00pm a storm slab avalanche occurred in beehive basin on a west aspect @9000 ft. This slab was 6-8” deep and propagated around 50’. No one was buried, however we aren’t sure if anyone was caught because we were not the party who triggered this avalanche. We did witness the party drop in but quick went out of sight." Photo: H. Bigos-Lowe

  • Skiers reported shooting cracks from their skis while ascending the terrain at Bridger Bowl. The group later remotely triggered an avalanche from 100'+ away that ran through the "Pearly Gates" and "Patrol Chute". 

  • On 4/18/22 near Cooke City we witnessed natural rollerballs and pinwheels by 11 am, and a couple wet loose slides below cliffs on southerly slopes around noon, and were able to easily trigger pinwheels on west-southwest aspects around 1230-1pm. Photo: GNFAC

  • A large drift on the Ramp just north of Bridger Bowl. Photo: GNFAC

  • Drifts cracked and slid on steep rollovers north of Bridger Bowl. Photo: K Hammonds

  • An avalanche on Wilson Peak that caught two skiers and injured one on 4/3/22. Photo: GNFAC

  • On 3/27/22 Big Sky ski patrol witnessed many natural wet slides in closed terrain. Photo: BSSP

  • "We also conducted avalanche mitigation on our Cabin’s Road at 4:30pm. The snowpack in this zone doesn’t get skied and is representative of the backcountry. The slope is ENE around 8,400’. Several wet slab avalanches were produced with explosives and ski cutting. The avalanches ranged from R4/D2 to R2/D1. They all hit the road and several crossed, and buried, the Cabin’s Road. Although most of this mitigation was done with explosives, it took minimal effort with skis to get snow moving. The crowns were 2-3’ deep and ran on the ground." Photo: YCSP

  • "A wet loose avalanche was seen in the Apron (closed terrain that hasn’t been opened this season) around 3:00pm. It was an R2/D2 on a east facing slope around an elevation of 8,500’." Photo: YCSP

  • Natural wet slab avalanche on Cedar Mtn. Observed 3/26/22. Photo: J. Gerardi

  • Natural slab avalanche on the Sphinx. Observed 3/26/22. Photo: J. Gerardi

  • From obs 3/26/22: "Freezing temps overnight created breakable crust in the morning which quickly deteriorated as the day warmed. (Temps rose surprisingly faster than we anticipated.  Experience large whumphs while ascending the NW shoulder of Electric Pk. at 9600 ft. Without hesitation we turned back and skied out the skin track. The snow became very rotten and we penetrated to boot-tops often while exiting." Photo:  S. Miller

  • On March 26 many natural wet slides occurred in closed terrain at Bridger Bowl. Photo: BBSP

  • We saw this natural avalanche on 3/19/22 appeared to be within 24 hours old and triggered by cornice fall that broke out a slab below. Northeast aspect at 8,800' on Lionhead Ridge. Photo: GNFAC

  • Wet slides occurred near Quake Lake on 3/3 or 3/4. Photo. T. Hansen

  • From obs 2/27/22: "Shooting cracks in a thin wind slab on a ridge crest. The slab was small but the collapse was abrupt and propagated 20 feet." Photo: J. Taylor

  • From obs. 2/27/22: "Shooting cracks in a thin wind slab on a ridge crest. The slab was small but the collapse was abrupt and propagated 20 feet." Photo: J. Taylor

  • "[Natural] Avalanche on the south side of Cabin Creek filled the creek and up the opposite bank." Appeared to be up to a week old. Photo: T. Sizemore

  • This is the slope that avalanched and killed a snow bike rider (motorized) on 2/19/22. Photo is from the Search and Rescue team who were leaving the site as it was getting dark, and did not have time to gather more info. Click link below for more details. Photo: B. Zavora

  • We saw this fairly recent, very small cornice fall avalanche on Cedar Mtn. on 2/12/2022. Photo: GNFAC

  • Chris Hericks, snow ranger on Beaverhead Deerlodge NF, points to the lower of two surface hoar layers. We are finding similar layering throughout our entire forecast area. The top 18" of the snowpack is weak and will quickly become unstable when it snows. Photo: GNFAC

  • Looking up from the bottom of the avalanche that killed one snowmobiler on Ski Hill. The crown is visible at the top of the hill. The men in the photo are standing near the trees where the victim was buried. Photo: GNFAC

  • The crown is not visible (it is down and right) but the X marks the approximate spot the rider was found. Photo: GNFAC

  • The crown was measured 4-11 inches deep and 75 feet wide. Photo: GNFAC

  • Looking at a weak layer of facets that the avalanche propagated on. Photo: GNFAC

  • Looking at the crown from below. Photo: GNFAC

  • A small, skier-triggered avalanche on Mt Blackmore on Sunday (Feb 6) would be unlikely to bury a skier or rider, but could push them into or off obstacles. Photo: E Stutzman

  • On Sunday, February 6, Gallatin Country Sheriff Search and Rescue and the GNFAC responded to a avalanche in Lionhead. A snowmobiler was killed on a small steep slope when a shallow avalanche carried him into a terrain trap of trees. Photo: GNFAC

  • This morning while ascending a line on Sawtooth Mountain (Lower Novocain) we triggered an avalanche (ASu-SS-R2-D2-O)  that caught and carried my partner an estimated 180M and partially buried him. His leg and hand were unburied and excavation of the head was done in less than 2 minutes of the incident. The avalanche only involved new snow from the last 48hrs and was triggered on a MF crust/facet combo 30cm down(formed 1/30/22). The avalanche was 30cm at its deepest and 20-30M wide and ran 250M. We were lucky to find both skis and poles a little ways downslope. No injuries were sustained.

    We both agree that we were trying to outsmart the instability that was present on steeper S facing terrain and should have turned around much sooner, we were very lucky. There was 30+cm HST in favored areas and the high winds from 1/31/22 formed some sensitive windslabs in specific areas. 

     

  • Graph of Snow Water Equivalent (SWE) at SNOTEL sites in the GNFAC forecast area from October 1, 2021 to January 30, 2022. It highlights the extended dry conditions in January that contributed to weak layers forming at the top of the snowpack. GNFAC

  • Riders reported on 1/15/22: "Some surface hoar is forming on nearly every aspect at all elevations. over 1 cm thick in some areas." Photo: B. Rasmussen

  • Riders reported on 1/15/22: "Some surface hoar is forming on nearly every aspect at all elevations. over 1 cm thick in some areas." Photo: B. Rasmussen

  • Settlement rings around the base of trees near Cooke City, January 15, 2022. Photo: B. Fredlund

Videos- Southern Gallatin

WebCams


Electric Peak

Roosevelt Arch

Snowpit Profiles- Southern Gallatin

 

Select a snowpit on the map to view the profile image

Weather Stations- Southern Gallatin

Weather Forecast Southern Gallatin

Extended Forecast for

17 Miles SE Big Sky MT

Winter Weather Advisory May 29, 06:00pm until May 30, 03:00pm
Click here for hazard details and duration
Winter Weather Advisory
  • Tonight

    Tonight: A chance of rain showers before midnight, then a chance of rain and snow showers after 2am. Some thunder is also possible.  Snow level 8600 feet lowering to 8000 feet after midnight . Mostly cloudy, with a steady temperature around 37. South southeast wind 3 to 6 mph.  Chance of precipitation is 40%. Total nighttime snow accumulation of less than a half inch possible.

    Chance
    Showers then
    Chance
    Rain/Snow

    Low: 37 °F

  • Sunday

    Sunday: A chance of rain and snow showers before 8am, then rain showers. Some thunder is also possible.  Snow level 7800 feet rising to 9500 feet in the afternoon. High near 43. Southeast wind 6 to 10 mph becoming south southwest in the afternoon.  Chance of precipitation is 80%. Little or no snow accumulation expected.

    Rain/Snow
    then Showers

    High: 43 °F

  • Sunday
    Night

    Sunday Night: Rain showers before 10pm, then rain and snow showers between 10pm and 3am, then snow showers after 3am. Some thunder is also possible.  Snow level 9000 feet lowering to 7600 feet after midnight . Low around 33. South wind 7 to 11 mph becoming north northeast after midnight.  Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

    Rain/Snow

    Low: 33 °F

  • Memorial
    Day

    Memorial Day: Snow showers before 1pm, then rain and snow showers. Some thunder is also possible.  Snow level rising to 8000 feet in the afternoon. High near 41. Breezy, with a north wind 13 to 15 mph, with gusts as high as 23 mph.  Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

    Breezy. Snow
    Showers then
    Rain/Snow

    High: 41 °F

  • Monday
    Night

    Monday Night: Rain and snow showers likely before 1am, then a chance of snow showers. Some thunder is also possible.  Snow level 7900 feet lowering to 7600 feet after midnight . Cloudy, with a low around 31. North wind 9 to 14 mph, with gusts as high as 22 mph.  Chance of precipitation is 60%. Little or no snow accumulation expected.

    Rain/Snow
    Likely then
    Chance
    Rain/Snow

    Low: 31 °F

  • Tuesday

    Tuesday: A slight chance of snow showers before 1pm, then a slight chance of rain and snow showers between 1pm and 2pm, then a slight chance of rain showers after 2pm. Some thunder is also possible.  Mostly cloudy, with a high near 46. North northeast wind 8 to 11 mph.  Chance of precipitation is 20%.

    Slight Chance
    Snow Showers
    then Slight
    Chance
    Rain/Snow

    High: 46 °F

  • Tuesday
    Night

    Tuesday Night: Mostly cloudy, with a low around 29. North northeast wind 5 to 9 mph becoming south southeast after midnight.

    Mostly Cloudy

    Low: 29 °F

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after noon.  Snow level rising to 9600 feet in the afternoon. Mostly sunny, with a high near 53.

    Mostly Sunny
    then Slight
    Chance
    T-storms

    High: 53 °F

  • Wednesday
    Night

    Wednesday Night: Mostly cloudy, with a low around 34.

    Mostly Cloudy

    Low: 34 °F

The Last Word

Thank you to everyone that sent in observations, read the advisories, took an avalanche class or donated money, time or gear. Our success is directly related to community support and the Forest Service. Have a safe spring and summer! See this article for some general spring travel advice.


  <<  This is the most recent forecast.