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Archived

Avalanche Forecast

Jan 31st, 2021–Feb 1st, 2021
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Jasper.

Weather forecasts are showing uncertainty regarding the amount of new snow we may receive, ranging from 15cm to to 45cm over the next 48hrs.

Expect Hwy 93N closures for avalanche control and heightened avalanche danger if the amounts are significant.

Weather Forecast

Sunday night: Flurries. Accumulation: 11 cm. Low -5 C. Ridge wind south: 15 km/h gusting to 40 km/h.

Monday: Snow. Accumulation: 19 cm. High -2 C. Ridge wind south: 15-35 km/h. Freezing level: 1900 metres.

Tuesday: Flurries. Accumulation: 10 cm. High -4 C. Ridge wind southwest: 15 km/h gusting to 50 km/h. Freezing level: 1600 metres.

Snowpack Summary

Up to 35cm of storm snow could accumulate up to Mon eve. Expect to find new wind slab on lee ridgetop features and below. The new snow will overlie previously wind affected surfaces in non-sheltered areas in the alpine and below as well as widespread surface facets. Strong mid-pack in deeper areas overlies supportive basal layers.

Avalanche Summary

Field team reports no new avalanche activity observed.

Share your trip info at Mountain Information Network .

Confidence

Intensity of incoming weather systems is uncertain on Monday

Avalanche Problems

Storm Slabs

Likelihood and size dependent on wind effect and precip amounts

  • Minimize exposure during periods of heavy loading from new snow and wind.
  • Use caution in lee areas. Recent wind loading have created wind slabs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5

Loose Dry

Size and likelihood dependent on precip amounts. Previous surface faceting could make this problem more reactive.

  • Be careful of loose dry power sluffing in steep terrain.
  • Avoid travelling on ledges and cliffs where sluffing may have severe consequences.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 1.5

Persistent Slabs

  • Be aware of thin areas that may propogate to deeper instabilites.
  • If triggered the storm slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 3.5