Avalanche Forecast Waterton Lakes National Park

Date Issued: Valid Until:

Parks Canada Marcus Waring, Parks Canada

Avalanche Forecast

Thu Jan. 17th · 4:00PM

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low
Wind Slabs Wind Slabs
Deep Persistent Slabs Deep Persistent Slabs

Alpine

Danger Ratings Considerable

Treeline

Danger Ratings Considerable

Below Treeline

Danger Ratings Moderate

Alpine

Danger Ratings Considerable

Treeline

Danger Ratings Considerable

Below Treeline

Danger Ratings Moderate
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

Problems

Wind Slabs

Wind Slabs

Regardless of snowfall amounts, Wind Slabs will continue to build over a crust / surface hoar  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.

Likelihood

Likely

Expected Size

1 - 2.5
Deep Persistent Slabs

Deep Persistent Slabs

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.

Likelihood

Possible - Unlikely

Expected Size

2 - 3