Trip Planning for Southern Gallatin

as of 5:00 am
Dec 90″ | 25-35 S
Dec 8 0″ | 10-20 S
Dec 7 0″ | NA
9460′     12/10 at 01:00
5.0℉
- 24mph
Gusts Unknown mph
9000′     12/10 at 00:00
10℉
44″ Depth
Bottom Line: There is weak snow buried 2-3 ft deep that could avalanche under the weight of a skier or rider today. Natural avalanches have become unlikely, but human triggered slides remain possible. Dig to search for and test these weak layers in the middle of the snowpack before riding steep slopes. Be doubly skeptical of the weak layers if they are sitting beneath hard slabs of wind drifted snow. Also watch for thin fresh drifts forming today as new snow accumulates.
Primary Problem: Persistent Weak Layer

Past 5 Days

Mon Dec 5

Considerable
Tue Dec 6

Considerable
Wed Dec 7

Considerable
Thu Dec 8

Moderate
Fri Dec 9

Moderate

Relevant Avalanche Activity

Southern Madison
Ernie Miller Ridge
Collapsing on Ernie Miller Ridge
Ernie Miller Ridge
AS
Elevation: 9,300
Aspect: E
Coordinates: 44.9453, -111.1350
Caught: 0 ; Buried: 0

"We toured to Ernie Miller today and saw a natural avalanche on a NE slope around 9600 ft. We heard and felt multiple collapses on our way in. We dug a pit on an east facing slope around 9300 ft where we found 105 cm of snow. We got a ECTN 2 result, failing on an interface about 15cm from the surface and ECTP5 failing 40 cm from the surface."

"Toured up to Bacon Rind today and skied meadows off of the ridge. Noted many collapses and whumpfs in the snowpack as we ascended east aspects to the ridge."


More Avalanche Details

Relevant Photos

Displaying 1 - 11
  • From obs 12/3/22: "Looking east from the top of [Ernie Miller] ridge, we noted another crown on a west aspect that looked to be about 100' wide and deep." Photo: H. Darby

  • From obs 12/3/22: "Looking toward Ernie Miller ridge, we noted an old crown in the main bowl just below the summit. It was on an E-NE aspect, 200 or more feet wide and looked to be filled in with new snow but was still visible." Photo: H.Darby

  • From obs 12/3/22: "Toured up to Bacon Rind today and skied meadows off of the ridge. Dug a pit at 8700' on a W aspect. HS was 70cm. We got an ECTP12 45 cm up from the ground at the interface between wind packed snow and a layer of .5-1mm facets and mixed forms. That layer made up the bottom 45cm of the snowpack in that area. Dug another pit at 8800' on an E aspect. HS was 115cm. We got an ECTP 14 50cm up from the ground on that same interface as described above. The bottom 50cm of the snowpack looked to be facets and mixed forms. The upper 65cm in that area was a mixture of different layers of wind packed grains that ranged from F to 4F hardness." Photo: H. Darby

  • From obs 12/3/22: "Toured up to Bacon Rind today and skied meadows off of the ridge. Dug a pit at 8700' on a W aspect. HS was 70cm. We got an ECTP12 45 cm up from the ground at the interface between wind packed snow and a layer of .5-1mm facets and mixed forms. That layer made up the bottom 45cm of the snowpack in that area. Dug another pit at 8800' on an E aspect. HS was 115cm. We got an ECTP 14 50cm up from the ground on that same interface as described above. The bottom 50cm of the snowpack looked to be facets and mixed forms. The upper 65cm in that area was a mixture of different layers of wind packed grains that ranged from F to 4F hardness." Photo: H. Darby

  • 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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Snowpit Profiles- Southern Gallatin

 

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Weather Stations- Southern Gallatin

Weather Forecast Southern Gallatin

Extended Forecast for

17 Miles SE Big Sky MT

  • Overnight

    Overnight: Partly cloudy, with a low around 9. Wind chill values as low as -10. Breezy, with a south wind 16 to 18 mph, with gusts as high as 25 mph.

    Partly Cloudy
    and Breezy

    Low: 9 °F

  • Saturday

    Saturday: A 20 percent chance of snow after noon.  Mostly cloudy, with a high near 27. Wind chill values as low as -10. Breezy, with a south wind 20 to 22 mph, with gusts as high as 31 mph.

    Breezy.
    Mostly Cloudy
    then Slight
    Chance Snow

    High: 27 °F

  • Saturday
    Night

    Saturday Night: A 30 percent chance of snow, mainly after 10pm.  Mostly cloudy, with a low around 21. Breezy, with a south southeast wind 16 to 20 mph, with gusts as high as 28 mph.

    Chance Snow
    and Breezy

    Low: 21 °F

  • Sunday

    Sunday: Snow, mainly after 11am.  High near 30. Breezy, with a south wind 17 to 22 mph, with gusts as high as 31 mph.  Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    Snow and
    Breezy

    High: 30 °F

  • Sunday
    Night

    Sunday Night: Snow.  Low around 16. South southeast wind 8 to 14 mph.  Chance of precipitation is 80%. New snow accumulation of around an inch possible.

    Snow

    Low: 16 °F

  • Monday

    Monday: Snow.  High near 20. North wind 7 to 11 mph.  Chance of precipitation is 80%.

    Snow

    High: 20 °F

  • Monday
    Night

    Monday Night: A 40 percent chance of snow, mainly before 11pm.  Mostly cloudy, with a low around 4. North wind 8 to 11 mph.

    Chance Snow

    Low: 4 °F

  • Tuesday

    Tuesday: A 30 percent chance of snow, mainly before 11am.  Mostly cloudy, with a high near 16.

    Chance Snow

    High: 16 °F

  • Tuesday
    Night

    Tuesday Night: A 20 percent chance of snow.  Mostly cloudy, with a low around 2.

    Slight Chance
    Snow

    Low: 2 °F

The Last Word

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