Trip Planning for Southern Gallatin

as of 5:00 am
Today7″ | NA
Nov 27 0″ | NA
Nov 26 0″ | NA
9460′     03/30 at 14:00
Weather station is Offline
9000′     11/28 at 21:00
-1℉
28″ Depth
Bottom Line: Dangerous avalanche conditions exist in the mountains around West Yellowstone and Cooke City and in the Gallatin and Southern Madison Ranges where 9-13” of snow fell in the last 48 hours. Strong winds gusting to 65 mph created unstable drifts at many elevations and aspects. Human-triggered avalanches breaking up to two feet deep are likely on wind-loaded slopes. Larger avalanches breaking deeper into the snowpack are possible. Careful route-finding that avoids steep, wind-loaded slopes, a snowpack assessment focused on identifying instabilities in new and wind-drifted snow and conservative decision-making are essential.
Primary Problem: Wind-Drifted Snow

Past 5 Days

Thu Nov 24

Moderate
Fri Nov 25

Moderate
Sat Nov 26

Moderate
Sun Nov 27

Moderate
Today

Considerable

Relevant Photos

Displaying 1 - 7
  • At 1:30pm on 11/23 I intentionally triggered a fresh drift of snow in a narrow avalanche path along the edge of the north bowl at Bridger. Northeast aspect at 7,600’ elevation. The crown was 6-8” deep consisting of snow that fell today, 20’ wide and ran 250’ vertical. SS-ASc-R2-D1.5-I. Photo: GNFAC

  • Big Sky ski patrol triggered these slides with explosives on 11/22 during routine avalanche mitigation work. The avalanches were hard slabs that averaged 12" deep and broke on a weak layer above a crust on top of snow that fell in October. Photo: BSSP

  • Big Sky ski patrol triggered these slides with explosives on 11/22 during routine avalanche mitigation work. The avalanches were hard slabs that averaged 12" deep and broke on a weak layer above a crust on top of snow that fell in October. Photo: BSSP

  • Observer reported "A number of Avalanche Crowns on an east aspect at 9500 ft." in Tepee Basin.

  • An observer reported "A number of Avalanche Crowns on an east aspect at 9500 ft." in Tepee Basin

  • From obs: "Skied Hyalite Peak today and found a wind slab ~10cm deep. Ski cut a small cornice below the main face and broke a small slide that carried ~20’ with little energy with a ~25’ wide crown" Photo: C. Crowe

  • Evidence of wind-loading creating the conditions for avalanches in the Bridger Range. Cracking is an indicator of instability. The observer noted this was "Nothing consequential," but this shows that unstable drifts are forming. They will be more consequential where there is more snow and as the wind creates larger drifts. Photo: E Smith

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Weather Stations- Southern Gallatin

Weather Forecast Southern Gallatin

Extended Forecast for

17 Miles SE Big Sky MT

  • Tonight

    Tonight: A 20 percent chance of snow showers after 4am.  Partly cloudy, with a low around -3. Wind chill values as low as -15. East northeast wind around 6 mph becoming light and variable.

    Partly Cloudy
    then Slight
    Chance Snow
    Showers

    Low: -3 °F

  • Tuesday

    Tuesday: A 20 percent chance of snow showers before 8am.  Partly sunny and cold, with a high near 7. Wind chill values as low as -15. North northwest wind 5 to 13 mph becoming west in the afternoon. Winds could gust as high as 20 mph.

    Slight Chance
    Snow Showers
    then Partly
    Sunny

    High: 7 °F

  • Tuesday
    Night

    Tuesday Night: A 20 percent chance of snow showers after 11pm.  Mostly cloudy, with a low around 4. Wind chill values as low as -15. South southwest wind 9 to 14 mph, with gusts as high as 21 mph.

    Slight Chance
    Snow Showers

    Low: 4 °F

  • Wednesday

    Wednesday: A 40 percent chance of snow showers, mainly after 11am.  Mostly cloudy, with a high near 21. Wind chill values as low as -15. Breezy, with a south wind 16 to 20 mph, with gusts as high as 30 mph.  New snow accumulation of less than a half inch possible.

    Chance Snow
    Showers and
    Breezy

    High: 21 °F

  • Wednesday
    Night

    Wednesday Night: A 30 percent chance of snow showers.  Mostly cloudy, with a low around 17. Breezy, with a south wind 20 to 23 mph, with gusts as high as 32 mph.

    Chance Snow
    Showers and
    Breezy

    Low: 17 °F

  • Thursday

    Thursday: A 50 percent chance of snow showers.  Cloudy, with a high near 27. Breezy, with a south southwest wind 20 to 22 mph, with gusts as high as 33 mph.

    Chance Snow
    Showers and
    Breezy

    High: 27 °F

  • Thursday
    Night

    Thursday Night: Snow showers.  Low around 15. Breezy, with a south southwest wind 18 to 20 mph, with gusts as high as 28 mph.  Chance of precipitation is 90%.

    Snow Showers
    and Breezy

    Low: 15 °F

  • Friday

    Friday: Snow showers likely, mainly before 11am.  Partly sunny, with a high near 22. Breezy.  Chance of precipitation is 70%.

    Breezy. Snow
    Showers
    Likely then
    Chance Snow
    Showers

    High: 22 °F

  • Friday
    Night

    Friday Night: Mostly cloudy, with a low around 6.

    Mostly Cloudy

    Low: 6 °F

The Last Word

Your field observations are hugely helpful as we build a picture of snowpack stability. Let us know if it was a beautiful day or snowy, deep powder, avalanches seen or just boring riding. Submit your observations on our new page or read them all here.

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