Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Dec 11th, 2021–Dec 12th, 2021

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

Regions

Waterton Lakes.

15 cm snow and strong SW winds on Saturday has created wind slabs in lees. New windslabs may take time to bond to variable surfaces below. Still not enough snow to ski below treeline.

Weather Forecast

Sunday: Cloudy with flurries. Accumulation 5 cm. Strong SW winds . Alpine temps High -8. FL valley bottom.

Monday: Cloudy with sunny periods and isolated flurries. Alpine temps High - 4. Light S winds. FL valley 1500m.

Tuesday: Cloudy with flurries. Accumulation 9 cm. Alpine temps High - 4. Moderate SW winds. FL 1500m.

Snowpack Summary

15 cm of new snow since Saturday morning. Strong south west winds are creating 20- 30 cm wind slabs in lees at AL and TL. This overlies a variable surface of stripped rock, 30 cm wind slab and rain crust. Mid and lower pack is cohesive. 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 due to visibility, if you go out into the mountains please share your observations on the Mountain Information Network.

Confidence

Due to the number and quality 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.

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.