Avalanche forecast

Northwest Inland

Apr 11 – 12, 2017Avalanche Canada
View on map
Archived · expired 9 years ago

Avalanche danger

Thu
Fri
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low
Open full map

Highlights

Strong easterly winds on Tuesday-Wednesday may result in unusual snow loading patterns. Cornices are large and remain a significant concern.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    Small amounts of new snow and moderate to strong east winds may result in unusual loading patterns in lee features below ridgetops.

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–3
    Solar radiation is a common cornice trigger. Limit your exposure when it's cloudy and completely avoid cornices when it's sunny.

Confidence

Low - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Light precipitation and STRONG easterly winds on Tuesday-Wednesday. Unsettled weather and cool temperatures thereafter. WEDNESDAY: Mix of sun and cloud with occasional flurries (5-15cm possible). Strong easterly ridgetop winds. Freezing level around 1500 m.THURSDAY: Mainly cloudy with isolated flurries (2-5cm). Moderate southeasterly ridgetop winds. Freezing level around 1400 m.FRIDAY: Cloudy with scattered flurries (3-5cm). Light southerly ridgetop winds. Freezing level around 1300 m.

Avalanche Summary

On Monday, several loose wet avalanches to Size 2.5 were reported in the afternoon with solar input in the north of the region. Also in the north, a cornice failure on a northwest aspect resulted in a slab avalanche, Size 3.0.

Snowpack Summary

Small amounts of new snow (3-10cm) fell in the past three days. Winds were light to moderate (south through northeast) and may have created small wind slabs on lee features below alpine ridgetops. The new snow will likely be sitting on hard surfaces created by strong winds last week.Elevations below roughly 1300 m are experiencing a daily melt-freeze cycle and the snowpack is likely isothermal. The February crust and facet layer is 70-90 cm deep in the Houston Telkwas sled area and a deep persistent faceted weak layer is still lingering near the bottom of the snowpack in all areas.

Regions covered