Avalanche Forecast Jasper National Park

Date Issued: Valid Until:

Parks Canada jasper snow safety, Parks Canada

Avalanche Forecast

Thu Apr. 11th ยท 4:07PM

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low
Persistent Slabs Persistent Slabs
Loose Dry Loose Dry
Storm Slabs Storm Slabs

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Moderate

Below Treeline

Danger Ratings Low

Alpine

Danger Ratings Moderate

Treeline

Danger Ratings Low

Below Treeline

Danger Ratings Low
The Icefields could receive up to 25cm of new snow in the next 24 hours.

Weather Forecast

Some weather models are calling up to 20cm of snow overnight in the Parkers Ridge area and dramatically less further north in the Tonquin and Maligne Ranges. Freezing levels forecast as a dirunal cycle with overnight freezes in the valleys and to rise to 1800m during the days. Overall unsettled convective spring weather with light variable winds.

Snowpack Summary

A supportive crust exists to 2,100m near treeline. Higher up, at treeline and above, a winter snowpack remains on N aspects . Solar facing slopes have crusts extending higher into the alpine. At upper elevation a weak faceted layer buried down 20-50cm remains of concern. The snowpack sits on a weak base of facets and depth hoar.

Avalanche Summary

No new slab avalanches have been observed although signs of cornice failures up to size 2 have been reported

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Friday

Problems

Persistent Slabs

Persistent Slabs

Evidence from recent snowpack tests and whumphing would suggest that a weak layer of facets persists down 20-50cm in some areas, and may be becoming reactive with incremental loading from recent small snowfalls.

Whumpfing, shooting cracks and recent avalanches are all strong inicators of unstable snowpack.Carefully evaluate big terrain features by digging and testing on adjacent, safe slopes.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood

Possible - Unlikely

Expected Size

1.5 - 2.5
Loose Dry

Loose Dry

Large Sluffs have been observed out of steep alpine terrain from the recent incremental snowfalls.

Be cautious of sluffing in steep terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 1.5
Storm Slabs

Storm Slabs

Up to 20cm of snow is forecasted for the Icefields region Thursday night and into Friday morning. (Very little snow is forecasted for the Maligne and Tonquin areas)

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Unlikely

Expected Size

1 - 2