Avalanche Forecast

Avalanche Bulletin - Jasper National Park

Date issued

Oct 26, 2017 - 4:00 PM

Valid until

until further notice

Prepared by

jonas hoke

There is plenty of snow to create avalanche problems at upper elevations. With unseasonably warm temperatures in the forecast it would be wise to avoid avalanche terrain on Friday and Saturday.

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

Widespread avalanche activity is expected with daytime warming and solar input on both Friday and Saturday. Watch for small-large loose snow avalanches on solar aspects and windslabs on NE aspects. Be aware that avalanches may runout into terrain with little or no snow cover.

Snowpack Summary

A winter snowpack exists above 2000m, snow depths are 40-100+ cm in the Columbia Icefields region. Windslabs exists on NE aspects, below this several weak crust interfaces exist along which failures may occur. The bond at these crusts may vary greatly with aspect, elevation and burial depth.

Weather Forecast

An upper level ridge will bring clear skies and warm temperatures in to the weekend.

Friday - Clear skies, freezing levels 4000m, alpine highs +11, and light NW winds.

Saturday - Clear, increasing cloud in the PM, freezing levels 3900m, alpine highs +11, light NW winds.

Sunday - Mix of sun and cloud, freezing levels 1900m, light - mod N winds.

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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