Avalanche Forecast Waterton Lakes National Park
Wednesday 23rd January 2019
New windslabs may propagate further than expected on buried suncrust and surface hoar layers.
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
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.
Skier controlled wind slabs to 1 were reported in the Castle region yesterday.
Freezing levels are uncertain on Saturday
Likely - Possible
1 - 2
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.
Possible - Unlikely
2 - 3
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.