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Avalanche Forecast

Archived

Dec 13th, 2021–Dec 16th, 2021

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

Regions

Waterton Lakes.

Cautious skiing is possible above 1800m. Choose lines carefully.

Weather Forecast

Tuesday: 10cm of snow expected overnight, partially cloudy. Moderate winds at ridgetop . Alpine temps High -3. FL valley bottom.

Wednesday: Partially cloudy no precip expected today. Alpine temps High - 8. Moderate W winds. FL valley bottom.

Thursday: Partially cloudy with PM flurries. Alpine temps High - 6. Moderate SW winds. FL valley bottom

Snowpack Summary

5-15cm unconsolidated snow overlies a 20-40cm windslab ALP/TL atop a 10cm Dec 4 rain crust with facets below. A 20-60 cm thick Nov melt freeze crust complex completes the snowpack to ground. BTL has just reached threshold in some places. HS at TL is 100 - 170 cm deep.

Avalanche Summary

No new avalanches observed with good visibility. Observations in this area are still limited, if you go out into the mountains please share your observations on the Mountain Information Network.

Confidence

Due to the number of field observations

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.