Avalanche Forecast Waterton Lakes National Park

Date Issued: Valid Until:

Parks Canada adam greenberg, Parks Canada

Avalanche Forecast

Wed Jan. 23rd ยท 7:58AM

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low
Wind Slabs Wind Slabs
Deep Persistent Slabs Deep Persistent Slabs

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low

Alpine

Danger Ratings Considerable

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Moderate
New windslabs may propagate further than expected on buried suncrust and surface hoar layers.

Weather Forecast

Thursday: Mainly cloudy with isolated flurries. Moderate west winds. Alpine high -7Friday: Cloudy with sunny periods and isolated flurries. Moderate west winds. Alpine high -7Saturday: Mainly cloudy with isolated flurries. Moderate southwest winds. Freezing level is uncertain with models predicting anywhere between 1500 and 2200m

Snowpack Summary

30cm of recently wind affected snow has gradually loaded either a suncrust below 2000m on solar aspects or spotty surface hoar in sheltered areas between 1600 and 1900m. This may be a problem layer when we see more snow. The midpack is strong in deep snowpack areas, but the facets lingering at the bottom remain a concern in thinner areas.

Avalanche Summary

Skier controlled wind slabs to 1 were reported in the Castle region yesterday.

Confidence

Freezing levels are uncertain on Saturday

Problems

Wind Slabs

Wind Slabs

Southwest through northwest winds have formed thin wind slabs over a crust / surface hoar layer and may propagate farther than expected. Dig down and investigate the bond of new snow before committing to your line.

Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.

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

Elevations: Alpine, Treeline.

Likelihood

Likely - Possible

Expected Size

1 - 2
Deep Persistent Slabs

Deep Persistent Slabs

This layer likely requires a large trigger. Be cautious when transitioning from thick to thin snowpack areas

Avoid steep convexities or areas with a thin or variable snowpack.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible - Unlikely

Expected Size

2 - 3