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Archived

Avalanche Forecast

Nov 29th, 2024–Dec 2nd, 2024
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
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
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Recent winds have created new wind slabs and have stripped some areas of snow. More slabs will likely be formed with continued winds and snowfall this weekend.

There is still good riding to be had in sheltered areas.

Confidence

Moderate

Avalanche Summary

There have been several explosive controlled and natural avalanches up to size to 2 observed in the past week to the south of Jasper National Park, failing on the October crust at the base of the snowpack.

Snowpack Summary

15 cm of low density snow in sheltered areas overlies a faceted midpack. The November 20th surface hoar layer was found down 60 cm in one pit in the alpine. At treeline there is a crust down 30 cm. The October crust is widespread and is found near the base of the snow pack and has facets above and below. Snow depth is roughly 70 cm at treeline and tapers rapidly below.

Weather Summary

Friday Night

Mainly cloudy with isolated flurries.

Precipitation: Trace

Alpine temperature: Low -12 °C.

Ridge wind southwest: 15-30 km/h

Saturday

Cloudy with scattered flurries.

Accumulation: 5 cm.

Alpine temperature: High -7 °C.

Ridge wind southwest: 20-40 km/h

Sunday

Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: Low -8 °C, High -7 °C.

Ridge wind west: 10 km/h.

Terrain and Travel Advice

  • Be careful as you transition into wind-affected terrain.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.

Avalanche Problems

Wind Slabs

New windslabs have been made over the last few days. Expect more to be created this weekend if winds come in as forecast.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Persistent Slabs

The Oct 18 crust is found just above the ground with weak facets above and below it. There’s uncertainty around its distribution and triggerability. More activity has been observed to the south of JNP, but limited observations make it hard to predict when and where it may be a problem.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 1 - 2.5