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

Regions

Sea To Sky.

Avalanche danger is expected to increase over the day as a storm impacts the region.

Confidence

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

Weather Forecast

FRIDAY NIGHT: Cloudy with early-morning snowfall, accumulation 2 to 5 cm, 20 km/h southwest wind, alpine temperature -6 C.

SATURDAY: Cloudy with snowfall, accumulation 10 to 20 cm, 40 km/h southwest wind, alpine temperature -4 C, freezing level 1400 m.

SUNDAY: Early-morning snowfall then clearing, accumulation 5 to 10 cm, 20 km/h northwest wind, alpine temperature -8 C.

MONDAY: Clear skies, 10 km/h northwest wind, alpine temperature 0 C, freezing level rising to 2000 m.

Avalanche Summary

No new avalanches were observed on Thursday. Looking forward, avalanche activity may spike during stormy conditions on Saturday and into the night.

Snowpack Summary

A storm will bring snow above around 1400 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 an underlying melt-freeze crust everywhere except on north aspects above 1600 m. 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.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.