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Avalanche Forecast

Archived

Feb 9th, 2023–Feb 10th, 2023

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

New storm slabs will be reactive to ridder triggering.

Use cautious route-finding and evaluate snow and terrain carefully.

Confidence

Moderate

Avalanche Summary

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

A melt-freeze crust formed in mid-January is now buried 50 to 70 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

Thursday Night

Increasing clouds, up to 15 cm accumulation, winds south southwest 40 to 50, treeline temperatures 0 C and cooling.

Friday

Cloudy with sunny periods, up to 10 cm accumulation, winds southwest 30 to 40 km/h, treeline temperatures -5 C.

Saturday

Mostly cloudy, 2 to 5 cm accumulation, winds west southwest 25 to 30 km/h, treeline temperatures -7 C.

Sunday

Cloudy with possible sunny periods late in the day, 5 cm accumulation, winds southwest 25 km/h, treeline temperatures -2 C.

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.
  • The more the snow feels like a slurpy, the more likely loose wet avalanches will become.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.