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Avalanche Forecast

Archived

Dec 4th, 2021–Dec 7th, 2021

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

Regions

Waterton Lakes.

20 cm of snow sits on top dirt to 1800m. Below treeline remains well below threshold. Use extreme caution on approach and exits.

Weather Forecast

Sunday: Mix of sun and cloud. Winds strong decreasing to moderate throughout day. Alpine temps High -14. FL valley bottom.

Monday: Cloudy with sunny periods and isolated flurries. Alpine temps High - 15. Moderate SW winds. FL valley bottom.

Tuesday: Cloudy with chance of flurries. Alpine temps High - 9. Moderate SW winds. FL valley bottom.

Snowpack Summary

Snowpack at tree line is 100 - 70 cm deep. 20 cm of snow of light unconsolidated snow has fallen in the last 24 hours. South west winds have created soft wind slabs in AL and TL lees. Mid and lower pack is cohesive and refrozen after Nov 30 rain event. November melt freeze crusts are 30-20cm above ground. Under 1800m is below threshold.

Avalanche Summary

No new avalanches observed. Observations in the area are very 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 on Saturday

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.