Avalanche Forecast Waterton Lakes National Park

Monday 28th January 2019

Avalanche Danger Ratings Mon 28th Jan 4:00PM 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: Marcus Waring

Date Issued:

Valid Until:

Mondays upslope storm has led to reverse loading creating new wind slabs.  Use caution in lee terrain and shallow snowpack areas.

Weather Forecast

Tuesday: Mostly Sunny. Light to Moderate West Wind. Freezing Level valley bottomWednesday: Mainly Cloudy.  Moderate SW Wind. Alpine temperature inversion.Thursday: A mix of sun and cloud with freezing levels rising to 1400m. .

Snowpack Summary

15-20cm of snow from Monday's upslope storm sits on a variable, wind affected bed surface . A Sun crust is forming on solar aspects. The midpack is strong in deep snowpack areas, but the facets lingering at the bottom remain a concern in thinner areas.

Avalanche Summary

Size 1 loose dry on N -NW aspect at 2000m. No other avalanche activity observed

Confidence

Freezing levels are uncertain on Thursday

Wind Slabs Wind Slabs

Likelihood

Possible - Unlikely

Expected Size

1 - 2

Old Wind Slabs exist in typical lee ares but be on the lookout for reverse loading creating new Wind Slabs on Northerly aspects.

Keep an eye out for reverse loading created by an upslope storm.

Aspects: All aspects.

Elevations: Alpine, Treeline.

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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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