Regional Conditions for Centennial Range

as of 5:00 am
Oct 180″ |
Oct 17 0″ | 15-40 SW
Oct 16 0″ | 15-30 W
8775′     4/02 at 23:00
27 ℉
NW - 6 mph
Gusts 9 mph
7750′   10/19 at 2:00
26℉
Depth
Bottom Line: The expected snow and wind through the weekend will increase the chances of triggering an avalanche. Slopes that were dirt prior to the storm will not become dangerous with the new snow, but slopes above 8000’ harboring older snow will have the potential to slide. Slopes with dense, wind-loaded snow are inviting to ski and easy to ascend on skins or foot, however, freshly formed drifts will also be the most susceptible to avalanche.
Primary Problem: Wind-Drifted Snow

Snow Observations- Centennial Range & Lionhead

Centennial Range
Centennials - Montana
Hell Roaring Creek
Incident details include images

Remote triggered several slides from bottom of slope on south facing slope.

Full Snow Observation Report
Centennial Range
Centennials - Montana
Hellroaring Drainage
Incident details include images

Shallow snowpack ~30", west facing terrain around 8200' is faceted except for the top 6 inches. We observed poor structure and fair to good strength due to a lack of distinct layering (its mostly facets top to bottom).

On an east facing slope at 8,300' we observed a slightly deeper snowpack, but still widespread faceting. Poor structure but good strength. During a pit test at this aspect we did not get propogation on any layers (on 1/5/19.) This was all before the most recent round of snowfall however, clearly the facets present a major persistent layer that will cause issues with increased loading.

Full Snow Observation Report
Centennial Range
Reas Peak
Snowmobile triggered avalanche near Reas Peak
Incident details include images

From e-mail:"a snowmobile triggered slide in a S aspect in the Blue Creek Drainage SE of Reas Peak in the Centennials.  No one was caught and no injuries "

Full Snow Observation Report
Centennial Range
Centennials - Montana
Hellroaring Drainage: Huge "Whumphs"
Incident details include images

I was in the Hellroaring Drainage Yesterday, snow depths below 7,000' hover around 18", around 8,000' snow depths increase significantly but are still shallow i.e. less than 30". Witnessed the largest "whoomphs" I have ever felt (that's saying something since last Decemeber/Jan was horrendous), interestingly much of this was felt returning on the same skin track, telling me this is a stubborn layer that may not give right away. The largest was a collapse in a meadow nearly 0.25 miles long.

Full Snow Observation Report
Centennial Range
Give us your observations!
Incident details include images

After last season's two snowmobiler avalanche fatalities on Reas Peak in the Centennial Range we created this web page so riders could get good, relevant information regarding snowpack and avalanches. Although the Centennial Range is not part of the Gallatin National Forest Avalanche Center's forecast area, we are the closest avalanche center and have valuable information to share.

  • The snowpack in the Lionhead area outside West Yellowstone is typically very similar to the Centennial Range. When we issue Avalanche Warnings in Lionhead, the Centennials are also dangerous. Pictures, photos, and observations from the Lionhead area are windows into the conditions in the Centennials.
  • We designed this web page to be a one-stop-shop for anyone riding or skiing in the Centennials.
  • We need your observations to keep everyone safe. Fill out a form and let us know what you found and attach pictures or videos.
  • If you are riding in other parts of southeastern Idaho, go to avalanche.org and find the nearest avalanche center to get updated information. The snowpack and avalanche concerns in regions adjacent to avalanche centers are typically similar:
  • Another great resource for avalanche information can be found at the Adam Anderson Avalanche Project on Facebook.
  • Avalanche Education is paramount to making good decisions. All avalanche education in Idaho is listed HERE.
  • If you would like to sponsor a 1-hour avalanche awareness class for your store, club, or organization, drop us a line. We may be able to accommodate that.

Do not hesitate to reach out if you have any questions or suggestions. This webpage is a work in progress. Email us at mtavalanche@gmail.com

We hope everyone has a safe season!

GNFAC Forecasters:

Doug Chabot
Alex Marienthal
Eric Knoff
Ian Hoyer

Full Snow Observation Report

Avalanche Activity- Centennial Range & Lionhead

Northern Madison
Sphinx Mountain
Whumph on The Sphinx
Incident details include images
Sphinx Mountain
AF-O
Elevation: 9,000
Aspect: N
Coordinates: 45.1582, -111.4770
Caught: 0 ; Buried: 0

From e-mail on Saturday 10/5, climbers on the Sphinx found these conditions: "We found a lot of snow on the Sphinx today following heavy precip since Sam’s report two days ago [see photo]. 3-5 cm in the parking lot, 20 cm at the Sphinx-Helmet col. Moderate SW winds had created drifts almost a meter deep in places on the traverse to the ice routes on the north face. I backed off after a whumph on a particularly exposed section of the traverse. We tried different ledge systems above and below the normal approach route but found similar snow conditions throughout."

Photo: From 10/3 prior to 8-10" new snow, "No snow hazard of much concern on the approach. However, a quick hasty pit in an isolated wind pocket revealed a CT1 on this layer.  ice axe is to the ground."


More Avalanche Details

Photos- Centennial Range & Lionhead

Displaying 1 - 40

Videos- Centennial Range & Lionhead

Weather Forecast- Centennial Range

Extended Forecast for

10 Miles ESE Lakeview MT

  • Overnight

    Overnight: Partly cloudy, with a low around 22. Southwest wind around 7 mph.

    Partly Cloudy

    Low: 22 °F

  • Saturday

    Saturday: Snow. The snow could be heavy at times.  Patchy blowing snow between noon and 5pm. High near 31. South wind 8 to 13 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 29 mph.  Chance of precipitation is 100%. New snow accumulation of 4 to 8 inches possible.

    Heavy Snow
    and Patchy
    Blowing Snow

    High: 31 °F

  • Saturday
    Night

    Saturday Night: Snow, mainly before midnight.  Low around 22. South southwest wind 11 to 17 mph becoming west northwest in the evening. Winds could gust as high as 24 mph.  Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    Snow then
    Chance Snow

    Low: 22 °F

  • Sunday

    Sunday: A 40 percent chance of snow.  Patchy blowing snow before 7am. Partly sunny, with a high near 27. Blustery, with a west wind 17 to 22 mph, with gusts as high as 28 mph.  New snow accumulation of less than a half inch possible.

    Chance Snow
    and Patchy
    Blowing Snow

    High: 27 °F

  • Sunday
    Night

    Sunday Night: A 40 percent chance of snow.  Mostly cloudy, with a low around 22. South wind 13 to 17 mph, with gusts as high as 21 mph.  New snow accumulation of less than a half inch possible.

    Chance Snow

    Low: 22 °F

  • Monday

    Monday: A 30 percent chance of snow.  Mostly cloudy, with a high near 29. New snow accumulation of less than a half inch possible.

    Chance Snow

    High: 29 °F

  • Monday
    Night

    Monday Night: A 30 percent chance of snow, mainly after midnight.  Mostly cloudy, with a low around 27. New snow accumulation of less than a half inch possible.

    Chance Snow

    Low: 27 °F

  • Tuesday

    Tuesday: A chance of snow before 3pm, then a chance of rain and snow.  Cloudy, with a high near 33. Breezy.

    Chance Snow
    then Chance
    Rain/Snow and
    Breezy

    High: 33 °F

  • Tuesday
    Night

    Tuesday Night: A chance of rain and snow before 9pm, then a chance of snow.  Mostly cloudy, with a low around 24. Breezy.

    Chance
    Rain/Snow and
    Breezy then
    Slight Chance
    Snow

    Low: 24 °F

The Last Word

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