Avalanche forecast

South Coast

Mar 20 – 21, 2016Avalanche Canada
View on map
Archived · expired 11 years ago

Avalanche danger

Tue
Wed
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low
Open full map

Highlights

Forecast snowfall amounts for Sunday night and Monday vary greatly across the region. Pay close attention to how much snow falls in your area, and be prepared to back off to simple terrain.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–3
    New snow and southwest winds will form new wind slabs at treeline and above. New wind slabs will be most reactive at higher elevations where temperatures have remained colder.

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–5
    Cornices are huge and potentially weak. Stormy weather on Monday will encourage ongoing cornice development.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Monday

Weather Forecast

In most areas 8-15cm of snow is expected to fall between Sunday night and Monday afternoon. Another 10cm may fall on Monday night. Generally overcast skies and light flurries are forecast for Tuesday and Wednesday. Ridgetop winds will be moderate to strong from the southwest on Sunday night and Monday, and then become light on Tuesday and Wednesday. Freezing levels will hover around 1400m on Monday and Tuesday, and then drop to about 1200m by Wednesday.

Avalanche Summary

Observations were limited on Saturday, although a size 1.5 natural wind slab avalanche was observed near the Hurley Road on west aspect at treeline. New snow and wind on Sunday and Monday will encourage new wind slab activity at higher elevations while rain will promote a round of loose wet avalanche activity below treeline.

Snowpack Summary

New snow and moderate winds on Sunday and Monday will form new wind slabs at higher elevations. Below treeline, rain will saturate the upper snowpack. The new snow will overlie a sun crust on sun-exposed slopes, dry settled powder on shady slopes, and pockets of fresh wind slab in lee and cross-loaded terrain near ridge crests. Below the new snow the snowpack is strong and well-settled throughout with no notable persistent weaknesses. Cornices are reported to be large and fragile.

Regions covered