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Archived

Avalanche Forecast

Dec 19th, 2021–Dec 20th, 2021
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

Watch for increasing wind on Monday which will build fresh wind slabs, especially in the alpine. Eagle Mountain and Mt Bourgeau avalanche closure zones are CLOSED on Monday for avalanche control.

Weather Forecast

Cool temps and increasing wind on Monday. The wind is expected to increase to strong from the West. Warming temps and some new snow is expected on Wednesday.

Snowpack Summary

15-25 cm of low density surface snow with extensive wind effect in the alpine and tree line. The Dec 2 rain crust is present below 2200 m and down 40-60 cm with facets above and below. The Nov 5 crust/facet interface is found near the base of the snowpack and has formed a deep persistent layer. Snowpack depths at treeline are from 120 to 180 cm.

Avalanche Summary

A size 2 skier accidental was reported to Lake Louise ski patrol. The slide occurred just outside the ski are boundary on the exit to Purple Bowl. There was no involvement but it was reported as 25m wide by 200m long. Look for further details on the MIN. Otherwise no new avalanches observed or reported.

Confidence

Due to the number and quality of field observations on Sunday

Avalanche Problems

Wind Slabs

Forecasted strong winds on Monday will likely increase the sensitivity and distribution of wind slabs in alpine and tree line elevations. We expect this avalanche problem to be most prominent on lee features in the alpine.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1.5 - 2.5