Avalanche Forecast Waterton Lakes National Park

Thursday 24th January 2019

Avalanche Danger Ratings Thu 24th Jan 4:00PM Danger Ratings Alpine: Moderate Danger Ratings Treeline: Moderate Danger Ratings Below Treeline: Low Deep Persistent Slabs Deep Persistent Slabs Wind Slabs Wind Slabs

Parks Canada Forecaster: Marcus Waring

Date Issued:

Valid Until:

Freezing Levels are uncertain on Saturday. Expected recently formed Wind Slabs to become reactive as temperatures rise.

Weather Forecast

Friday: Cloudy with sunny periods and isolated flurries. Moderate west winds. Alpine high -7Saturday: Mainly cloudy with isolated flurries. Moderate westerly winds. Freezing level is uncertain but may rise into the alpine.Sunday:  5cm of snow with increasing West wind.

Snowpack Summary

30cm of recently wind affected snow sits atop a crust layer below 2000m . The midpack is strong in deep snowpack areas, but the facets lingering at the bottom remain a concern in thinner areas.

Avalanche Summary

No new Avalanche activity observed.

Confidence

Freezing levels are uncertain on Saturday

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.

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Wind Slabs Wind Slabs

Likelihood

Possible

Expected Size

1 - 2

Westerly winds have formed thin wind slabs over a crust layer.

Use caution in lee areas. Wind loading could create slabs.

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

Elevations: Alpine, Treeline.

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