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Archived

Avalanche Forecast

Apr 11th, 2024–Apr 12th, 2024
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
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

Regions: Glacier.

Good winter skiing can be found on true northerly aspects in the Alpine and upper Tree-line. Elsewhere expect to find challenging travel, with a variety of crusts capping a thinning snowpack.

Confidence

High

Avalanche Summary

Thursday, a field team observed two remotely triggered size 1 storm slabs above the Bonney Moraines on E aspects, failing on the Apr 9th crust.

There were several large (up to size 3) avalanches observed in the highway corridor in recent days - storm slabs suspected to be failing on the April 9th crust.

Wednesday, a field team in the Christiana Ridge zone was able to ski-control moist storm slabs on steep solar aspects, sliding on the April 9 melt/freeze crust.

Snowpack Summary

In the Alpine and high Tree-line, 20-30cm of settling snow sits over a firm crust on solar aspects and well settled dry snow on northerly aspects.

At tree line the snow depth is at a record low of around 220cm. The Feb 3rd crust/facet layer persists at upper elevations, buried down 80-140cm.

Below tree line is a well-settled spring snowpack with a strong surface crust that will break down during the heat of the day.

Weather Summary

Unsettled weather overnight into Friday, with a slight improving trend for the weekend.

Tonight: Cloudy, flurries (up to 5cm). Alpine low -2°C, freezing level (FZL) 1600m. Light S ridgetop winds.

Fri: Mixed sun/cloud, isolated flurries. High 1°C, FZL 2100m. Gusty mod SW winds.

Sat: Mix sun/cloud. Low -2 °C, High 3 °C, FZL 2400m. Gusty strong SW winds.

Sun: Mix sun/cloud. Low -1 °C, High 4 °C, FZL 2400m. Light SW wind.

Terrain and Travel Advice

  • Carefully monitor the bond between the new snow and old surface.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.

Avalanche Problems

Storm Slabs

The new snow will need time to bond to the old surfaces, especially where it sits over a firm crust. Use extra caution near ridge crests and lee features where deeper wind deposits will be more reactive. Expect natural avalanches on solar aspects when the Spring sun shines!

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5