Avalanche Forecast Waterton Lakes National Park

Thursday 17th January 2019

Avalanche Danger Ratings Thu 17th 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:

New wind slabs from the incoming storm on Saturday will likely be forming on a recently buried crust and surface hoar layer, creating the potential for touchy conditions. Keep an eye on snowfall amounts and evaluate the bond of the new snow.

Weather Forecast

FRIDAY Isolated Flurries. Light SW wind.SATURDAY Snowfall amounts are uncertain. Estimating between 5-20cm. Strong SW Wind. SUNDAY Cloudy with sunny periods. Moderate W Wind.

Snowpack Summary

5-10cm off storm snow on Thursday has fallen over a variety of hard bed surfaces including newly buried Surface Hoar 1600-1900m and a supportive temperature crust up to 2000m. A strong Midpack sits on top of a faceted base.

Avalanche Summary

No new avalanches observed. Limited Alpine observations.

Confidence

Forecast snowfall amounts are uncertain on Saturday

Wind Slabs Wind Slabs

Likelihood

Likely

Expected Size

1 - 2.5

Regardless of snowfall amounts, Wind Slabs will continue to build over a crust / surface hoarĀ  layer during the forecast period.

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

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

Elevations: All elevations.

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Deep Persistent Slabs Deep Persistent Slabs

Likelihood

Possible - Unlikely

Expected Size

2 - 3

This layer likely requires a large trigger. New wind slabs may step down causing large avalanches.

Pay attention to overhead hazards like cornices which could trigger the deep persistent slab.Avoid steep convexities or areas with a thin or variable snowpack.

Aspects: All aspects.

Elevations: All elevations.

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