Avalanche Forecast Banff Yoho & Kootenay National Park

Date Issued: Valid Until:

Parks Canada snow safety, Parks Canada

Avalanche Forecast

Sat Apr. 13th ยท 4:00PM

Alpine

Danger Ratings Below Threshold

Treeline

Danger Ratings Below Threshold

Below Treeline

Danger Ratings Below Threshold
Wind Slabs Wind Slabs
Persistent Slabs Persistent Slabs

Alpine

Danger Ratings Below Threshold

Treeline

Danger Ratings Below Threshold

Below Treeline

Danger Ratings Below Threshold

Alpine

Danger Ratings Below Threshold

Treeline

Danger Ratings Below Threshold

Below Treeline

Danger Ratings Below Threshold
Expect windslab formation to continue. Be careful on lees of ridgecrests.

Weather Forecast

Strong winds clouds, cool temperatures and light precipitation are forecast. In the short term, expect an increase in windslab formation.

Snowpack Summary

10 to 30cm has fallen since April 9. the new snow is being pushed into small windslabs on lee N and E aspects. Facets 50 to 70cm deep produce clean, hard shears but have not produced an avalanche for a long time. Shallow bottomless facets can be found on high north aspects.

Avalanche Summary

A small skier triggered windslab was noted on the lee side of a ridgecrest today.

Confidence

Problems

Wind Slabs

Wind Slabs

The first indications that recent snow has started to form a new slab are being reported. With winds expected to increase to moderate late Friday and then strong mid day Saturday, expect rapid development of new slabs.

If triggered the wind slabs may step down to deeper layers resulting in large avalanches.Minimize overhead exposure during periods of heavy loading from new snow, wind.

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

Elevations: Alpine.

Likelihood

Possible - Unlikely

Expected Size

1 - 1.5

Persistent Slabs

Persistent Slabs

These slabs remain a concern on north aspects in the alpine where March winds built slabs over the facetted snow from February's cold snap. It is wise to check in on this layer now found 40- 70cm deep before venturing into committing terrain.

Dig down to find and test weak layers before committing to a line.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood

Unlikely

Expected Size

1 - 2