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Avalanche Forecast

Archived

Apr 19th, 2023–Apr 20th, 2023

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

Regions

Kitimat, Seven Sisters, Howson.

Wind slabs exist on north-facing slopes in the alpine. They may be reactive to rider triggering.

Confidence

Low

Avalanche Summary

No new avalanches reported.

Observations are limited at this time of year, please consider sharing any information or photos you have on the Mountain Information Network to help guide our forecasts.

Snowpack Summary

In the alpine up to 10 cm of new snow sits above old wind-pressed snow and a crust interface. Isolated wind slabs exist in leeward (northerly) terrain.

A weak layer buried in late March is down 40-60 cm and exists as surface hoar and facets on north-facing slopes and a crust elsewhere. Reports indicate that this snow is settling and bonding to the old interface.

At treeline elevations, a melt-freeze crust exists on all aspects.

The mid and lower snowpack is considered generally strong and well-bonded.

Weather Summary

Wednesday Night

Trace of new snow. Ridgetop winds 40-50 km/h from the southeast. Temperature at treeline around -5 C and freezing level valley bottom.

Thursday

Mostly cloudy. Ridgetop wind 30-50 km/h from the southeast. Temperature at treeline around -4 C freezing level 1200 m.

Friday

Mix of sun and cloud. Ridgetop wind 15-20 km/h from the southwest. Temperature at treeline around -4C with freezing level 1100 m.

Saturday

Cloudy. Ridgteop wind 30-50 Km/h from the southwest. Temperature at treeline -3 C with freezing levels near 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for areas of hard wind slab on alpine features.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.