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Avalanche Forecast

Archived

Apr 2nd, 2021–Apr 3rd, 2021

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

A storm will increase danger above the snow-rain line. Carefully assess for changing conditions as the day progresses.

Confidence

Moderate - Uncertainty is due to the timing, track, & intensity of the incoming weather system.

Weather Forecast

FRIDAY NIGHT: Cloudy, 20 km/h southwest wind, treeline temperature -1 C, freezing level 1200 m.

SATURDAY: Cloudy with snowfall, accumulation 10 to 20 cm, 40 km/h southwest wind, treeline temperature -1 C, freezing level 1200 m.

SUNDAY: Early-morning snowfall then clearing, accumulation 10 to 15 cm, 20 km/h east wind, treeline temperature -4 C.

MONDAY: Mostly cloudy, 20 km/h northwest wind, treeline temperature -2 C.

Avalanche Summary

No new avalanches were reported over the past few days. Looking forward, avalanche activity may spike during the storm.

 

Snowpack Summary

A storm will bring snow above around 1200 m and strong southwest wind. Around 10 to 20 cm is expected to accumulated by Saturday afternoon, forming new storm slabs in sheltered terrain and wind slabs in exposed terrain at high elevations. The snow may take a few days to bond to a melt-freeze crust. Below the rain-snow line, rain will soak an already moist snowpack.

Cornices are large and looming along ridgelines. Their release is unpredictable, requiring a large berth if you're travelling above or below them.

Terrain and Travel

  • Watch for fresh storm slabs building throughout the day.
  • Wind slabs are most reactive during their formation.
  • Make observations and assess conditions continually as you travel.
  • Extra caution is needed around cornices under the current conditions.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.