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Avalanche Forecast

Archived

Feb 10th, 2023–Feb 11th, 2023

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Snow that has accumulated this week is now being turned into wind slabs by light to moderate southerly winds.

Use caution as you transition into wind affected terrain.

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported on Friday. Snowpack test reports have shown that there may be instability within the storm snow that fell this past week.

On Thursday, there have been reports of widespread wet loose avalanches throughout our region on all aspects below 1500 m. Even with cooling temperatures, this may continue into Friday.

Please continue to post your reports and photos to the Mountain Information Network.

Snowpack Summary

Around 45 of recent snow now sits on a variety of surfaces. It will have been redistributed at higher elevations by southerly winds.

A melt-freeze crust formed in mid-January is now buried 60 to 80 cm deep. At the moment this layer is gaining strength. The snow below this layer is consolidating nicely. Buried up to 120 cm is another layer of concern, a crust, formed near the end of December.

Snowpack depths are below seasonal averages. Total amounts range from 150 to 200 cm at treeline, but decrease significantly below 1500 m.

Weather Summary

Friday Night

Mainly cloudy with clear periods, up to 5 cm accumulation, winds southwest 20 to 30 km/h, treeline -4 °C and cooling.

Saturday

Mostly cloudy, trace accumulation, winds west southwest 25 to 30 km/h, treeline -6 °C.

Sunday

Mostly cloudy, up to 10 cm accumulation starting in the late afternoon and continuing into the evening, winds southwest 25 to 40 km/h, treeline -2 °C.

Monday

Cloudy, 10 cm accumulation, winds southwest 40 km/h, treeline -5 °.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be carefull around freshly wind loaded features.
  • Keep your guard up at lower elevations. Wind slab formation has been extensive.

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.