Avalanche Forecast Glacier National Park

Saturday 26th January 2019

Avalanche Danger Ratings Sat 26th Jan 8:00AM Danger Ratings Alpine: Considerable Danger Ratings Treeline: Considerable Danger Ratings Below Treeline: Moderate Persistent Slabs Persistent Slabs Wind Slabs Wind Slabs

Parks Canada Forecaster: andrew jones

Date Issued:

Valid Until:

Watch for rising temperatures that will cause avalanche hazard to increase this afternoon. Expect reactive slabs around treeline.

Weather Forecast

It will remain cloudy today, but a ridge of high pressure deflects any precipitation from the region. Freezing levels rise to 1400m with the possibility of an above freezing layer at higher elevations. Ridge winds west 25-40 km/h.

Snowpack Summary

In specific locations, strong S winds have redistributed storm snow and created loaded pockets and wind slabs on lee and cross-loaded features at treeline and above. The Jan 17 persistent weak layer down 30cm is surface hoar in sheltered areas and sun crust on solar aspects.

Avalanche Summary

A natural size 2.0 was observed in the highway corridor east of Rogers Pass on steep north facing terrain on Macdonald Gully #3 slide path. We received reports of fast sluffs in steep terrain below treeline where unconsolidated snow is moving over buried surface hoar crystals.

Confidence

Freezing levels are uncertain

Persistent Slabs Persistent Slabs

Likelihood

Likely

Expected Size

1 - 2

The Jan 17th layer is down 20-40cm and consists of surface hoar in sheltered areas and sun crust on steep solar aspects. This layer is most problematic between 1600-2100m. Warm temperatures will cause this slab to consolidate and increase the hazard.

Use caution on open slopes and convex rolls where buried surface hoar may be preserved.Dig down to find and test weak layers before committing to a line.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

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Wind Slabs Wind Slabs

Likelihood

Likely - Possible

Expected Size

1 - 2

Strong S winds continue to load lee aspects and create windslabs at treeline and above. These slabs have been easily triggered by skier loads in steep unsupported terrain. When triggered, wind slabs may propagate into large avalanches.

Stay well to the windward side of corniced ridges.Watch for shooting cracks or stiffer feeling snow. Avoid areas that appear wind loaded.

Aspects: All aspects.

Elevations: Alpine, Treeline.

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