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Archived

Avalanche Forecast

Feb 13th, 2020–Feb 14th, 2020
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
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: South Coast.

Watch for wind loaded pockets below ridge crests and steep roll-overs. Fresh wind slabs may be sensitive to human triggering.

Confidence

High -

Weather Forecast

Thursday night: Up to 10 cm new snow. Winds moderate west to northwest. Freezing level 900 m.

Friday: Mix of sun and cloud. Winds moderate northwest. Freezing level 1000 m.

Saturday: Up to 10 cm new snow. Winds strong southwest. Freezing level around 1000 m.

Sunday: Flurries. Winds strong southwest. Freezing level around 800 m.

Avalanche Summary

A small skier triggered slab avalanche on the rain crust was reported on Saturday (see this MIN report). The bond at this interface appears to be strengthening over time.

Snowpack Summary

Around 20 cm of recent storm snow sits over wind affected surfaces in the alpine and dense, well-settled snow at lower elevations. A thick rain crust sits 40-50 cm below the surface. The snowpack below consists of moist to wet snow and is well settled. Snowpack depths are in the range of 200-250 cm around the peaks of the North Shore mountains (1400 m), tapering quickly with elevation to almost nothing below 1000 m.

Terrain and Travel

  • Be carefull around freshly wind loaded features.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Be alert to conditions that change with elevation and sun exposure.

Avalanche Problems

Wind Slabs

Winds have switched from southwest during the snowfall to northwest so wind slabs can be found on a variety of aspects. Watch for deep wind loaded pockets in lee features in the alpine.

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 1.5