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Avalanche Forecast

Dec 19th, 2023–Dec 20th, 2023
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Buried surface hoar remains the primary avalanche concern, and may be prone to human-triggering where present.

Confidence

Moderate

Avalanche Summary

Sporadic reports continue to provide evidence that buried surface hoar layers remain human-triggerable. Avalanches up to size 2.5 have mostly occurred in treeline and alpine terrain, but have been reported as low as 1950 m.

This Mountain Information Network (MIN) post from neighboring Glacier National Park is the most recent occurrence.

Snowpack Summary

Roughly 30 cm of recent snow continues to settle and stabilize with mild temperatures and minimal wind. A layer of buried surface hoar may exist below the recent storm snow in wind-sheltered features. A crust exists down roughly 40 cm from the surface at treeline and below.

A problematic layer of surface hoar is now roughly 50-90 cm below the surface.

The lower snowpack is generally facetted with a hard crust found just above the ground. Generally, the snowpack remains shallow for this time of year, with average treeline snow depths around 80 to 120 cm.

Weather Summary

Tuesday Night

Cloudy with 2 to 8 cm of snow, southwest alpine winds 20 to 40 km/h, treeline temperature -2 °C.

Wednesday

Cloudy with 2 to 8 cm of snow, southwest alpine winds 20 to 40 km/h, treeline temperature -2 °C.

Thursday

Cloudy with 2 to 8 cm of snow, southwest alpine winds 40 to 60 km/h, treeline temperature -2 °C.

Friday

Cloudy with 2 to 8 cm of snow, south alpine winds 40 to 60 km/h, treeline temperature -2 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Uncertainty is best managed through conservative terrain choices at this time.
  • Avoid areas where the snow feels stiff and/or slabby.
  • Use caution when approaching steep and rocky terrian.

Avalanche Problems

Persistent Slabs

A layer of surface hoar is down 50-90 cm in the snowpack and has been the culprit of a number of scary, human triggered avalanches in neighboring regions.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5