Avalanche Forecast

Avalanche Bulletin - Jasper National Park

Date issued

Oct 31, 2017 - 4:00 PM

Valid until

until further notice

Prepared by

Jonas Hoke

With cold temps, new snow and variable upper elevation winds, watch for pockets of windslab to develop quickly in open areas. Seasonal closures are now in effect in many regions of Jasper National Park, for further details click here.

Danger Ratings
Problems
Details

Early Season Conditions

Insufficient observations exist to reliably rate the avalanche danger. Expect shallow snow cover with thinly buried rocks and trees just beneath the surface. Avalanche danger often concentrates in gullies and other deposition areas, where windslabs may bond poorly to a weak underlying base. Deeper snow usually exists at higher elevations.

More Early Season Details

Avalanche Summary

Windslab development in lee areas, and gully features are most concerning. No direct observations or reports.

Snowpack Summary

A 'snowpack' exists above 2000m. Variable snow depths from 30 to 80 cm in the Columbia Icefields region. Windslabs exists on NE aspects. Inconsistent structure to the snowpack based on aspect, and elevation require careful evaluation for cohesion at any interface, and new slab development.

Weather Forecast

Colder temps and light to moderate winds (N switching to Easterly) will predominate the area in the wake of Tuesdays snowfall, with mostly cloudy skies persisting through the week.

Danger Ratings Explained

1 - Low

Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

Natural and human-triggered avalanches unlikely.

Small avalanches in isolated areas or extreme terrain.

2 - Moderate

Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

Natural avalanches unlikely; human-triggered avalanches possible.

Small avalanches in specific areas; or large avalanches in isolated areas.

3 - Considerable

Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.

Natural avalanches possible; human-triggered avalanches likely.

Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

4 - High

Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.

Natural avalanches likely; human-triggered avalanches very likely.

Large avalanches in many areas; or very large avalanches in specific areas.

5 - Extreme

Avoid all avalanche terrain.

Natural and human-triggered avalanches certain.

Large to very large avalanches in many areas.

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