Avalanche Forecast Waterton Lakes National Park

Wednesday 23rd January 2019

Avalanche Danger Ratings Wed 23rd Jan 7:58AM Danger Ratings Alpine: Moderate Danger Ratings Treeline: Moderate Danger Ratings Below Treeline: Low Wind Slabs Wind Slabs Deep Persistent Slabs Deep Persistent Slabs

Parks Canada Forecaster: adam greenberg

Date Issued:

Valid Until:

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

Wind Slabs Wind Slabs

Likelihood

Likely - Possible

Expected Size

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.

More
Deep Persistent Slabs Deep Persistent Slabs

Likelihood

Possible - Unlikely

Expected Size

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.

More
Offline, Anywhere Members can email a forecast to themselves, meaning it's available offline Join