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Avalanche Forecast

Archived

Feb 13th, 2023–Feb 14th, 2023

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

Regions

South Coast Inland, Birkenhead, Duffey, South Chilcotin, Stein, Taseko.

Dangerous avalanche conditions exist in the alpine where storm snow and strong winds have built fresh wind slabs.

Be alert to conditions that change with aspect and elevation, especially on slopes being impacted by direct sun. Periods of intense solar radiation could quickly initiate a natural avalanche cycle.

Confidence

High

Avalanche Summary

On Monday afternoon, search and rescue technicians responded to a fatal avalanche incident north of the Sea to Sky region. The avalanche is believed to have occurred on Saturday and was initiated in a shallow rocky area. See the MIN for more details.

Poor visibility through the weekend kept most operators from seeing into higher elevations. On Saturday, a small cornice chunk was reported to have triggered a size 1 wind slab avalanche.

On Friday, wind slab avalanches were reported to be reactive to natural and human triggers. A size 1.5 skier remote avalanche was triggered from 10 m away on a west aspect at 1700 m. See MIN for details and photos. A cornice triggered a size 2 avalanche on a northeast slope in the alpine. These are both good reminders to use extra caution as you are transitioning into wind-affected terrain and be aware of the overhead hazard.

Please continue to share any observations or photos on the Mountain Information Network.

Snowpack Summary

10-20 cm of recent storm snow overlies 60-80 cm of wind-affected snow and a crust at lower elevations. A melt-freeze crust is found down 50-80 cm and has been reactive in test pits however we have not seen recent avalanches on this layer.

The snowpack in this region is generally weak and shallow with sugary snow near the base. Avoid areas where snowpack depth varies rapidly like thin rocky start zones. Snowpack depths around treeline range between 150 to 250 cm.

Weather Summary

Monday Night

Cloudy with lingering convective flurries, 1-5 cm accumulation. West winds switch to the north 20 km/h. Treeline temperature -10 °C. Freezing levels drop from 1000 m to valley bottom.

Tuesday

Mix of sun and cloud. Winds north northwest 10 to 15 km/h. Treeline temperature -8 °C. Freezing level 800 m.

Wednesday

Mainly sunny with clouds increasing in the afternoon. Winds west 10 to 25 km/h. Treeline temperature -10 °C. Freezing level 600 m.

Thursday

Mix of sun and cloud with isolated flurries, trace accumulation. Winds southwest 25 km/h gusting to 40 km/h. Treeline temperature -8 °C. Freezing level 800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • Avoid exposure to overhead hazards when solar radiation is strong.

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.