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Archived

Avalanche Forecast

Mar 6th, 2021–Mar 7th, 2021
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
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

Regions: Jasper.

Weather Forecast

Sunday: Sunny with cloudy periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: High -7 C.

Ridge wind southwest: 15 km/h gusting to 45 km/h.

Monday: A mix of sun and cloud.

Precipitation: Nil.

Alpine temperature: Low -12 C, High -9 C.

Mostly light ridge wind occasionally gusting to 35 km/h.

Snowpack Summary

5-10cm of new snow at treeline. Warm temps and high solar input have created crusts and moist snow on solar aspects at TL and BTL. Continuing SW winds have extensively redistributed the snow pack at TL and ALP. The midpack is supportive in deep areas, but shallow snowpack areas are weak and failing in buried facet layers in test results.

Avalanche Summary

Numerous loose wet and slab avalanches on solar aspects up to size 2, mostly at TL and BTL observed on Thursday into Friday. Only smaller activity observed on Saturday thanks to cooler temps. Several large natural slab avalanches observed in high alpine features over the past week, many were step downs from wind slabs or were cornice triggered.

Confidence

Timing or intensity of solar radiation is uncertain

Avalanche Problems

Wind Slabs

Ongoing moderate SW winds will continue to form slabs in the alpine and exposed treeline features.

  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
  • Use caution in lee areas. Recent wind loading have created wind slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5

Deep Persistent Slabs

Caution in thin facetted snowpack areas where triggering is more likely. This is a low probability but high consequence problem.

  • Avoid shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3

Loose Wet

The sun is packing a strong punch on south through west aspects when it comes out.

  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Aspects: South East, South, South West, West.

Elevations: Treeline, Below Treeline.

Likelihood: Possible

Expected Size: 1 - 2