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Avalanche Forecast

Archived

Feb 11th, 2023–Feb 12th, 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 and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Fresh storm slabs will require some time to settle and stabilize, use extra caution as you transition into wind effected terrain.

Confidence

Moderate

Avalanche Summary

There were a few large natural avalanches (up to size 3.0) from steep terrain in the highway corridor Friday through Saturday morning.

Snowpack Summary

Up to 60cm of storm snow has fallen in the past week, accompanied by periods of strong SW winds. This has left several potential failure planes in the upper snowpack, especially in wind exposed areas.

The mid-snowpack is generally well bonded, rounded grains.

The basal Nov 17 deep persistent weak layer has not produced any slab avalanches in GNP for several weeks now, but persists in many places as faceted crystals - these are accompanied by a decomposing crust in some locations.

Weather Summary

Another frontal system arrives Sunday night into Monday.

Tonight: Mainly cloudy with isolated flurries, Alpine low -9°C. Light SW ridgetop winds.

Sunday: Flurries turning to snowfall in the afternoon (10-15cm). Alpine High -5°C. Moderate-strong SW wind.

Monday: Snow (10-15cm). Low -10°C, High -7°C. Strong SW wind.

Tuesday: Mix of sun and cloud. Low -16°C, High -11°C. Light northerly winds.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Avoid freshly wind loaded terrain features.

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.