Glacier National Park Avalanche Forecast

Issued: Nov 23rd, 2021 4:00PM

Tue Nov 23rd Current Conditions
Alpine Moderate Treeline Moderate Below Treeline Low
Wed Nov 24th 2 Day Outlook
Alpine Considerable Treeline Considerable Below Treeline Moderate
Thu Nov 25th 3 Day Outlook
Alpine High Treeline Considerable Below Treeline Considerable

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs.

Wind slabs have been reported to fail under the weight of skiers/riders in convex, unsupported terrain in the Alpine.

Travel in the thick forest continues to be harsh, with dust on a firm crust hiding near-surface rocks, stumps, and open creeks.

Summary

Weather Forecast

A benign Wed followed by a significant storm with rising temps on Thurs/Fri

Tonight: Mainly cloudy, Alpine low -14*C, light W ridge-top winds

Wed: Flurries, 5cm, Alpine high -9*C, mod SW ridge-top winds

Thurs: Snow, 25cm, Alpine high -4*C, strong SW winds

Fri: Snow, 15-20cm, Alpine high -3*C, mod SW winds

Snowpack Summary

40-45cm of snow has fallen over the last few days and has been redistributed by 25-40km/hr Southerly winds. At tree line the new snow covers the widespread November 15th crust. Mid-slope wind slabs have been reported in lee features in both the Connaught and Asulkan. Below ~1700m a breakable crust and refrozen snow/ice chunks make for poor travel.

Avalanche Summary

Several skier triggered avalanches, all wind slabs, were reported from Monday afternoon; one from the Pterodactyl, one from Nikki's Notch, and one from steep E-facing alpine terrain between Grizzly Mtn and Little Sifton. These were all mid-slope avalanches, down considerably from ridge-top.

No notable avalanches were observed in the highway corridor

Confidence

Due to the number of field observations

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Possible

Expected Size

1 - 2

Moderate S'ly winds have distributed loose surface snow and formed wind slab in the alpine and exposed tree-line areas. A fresh 5cm dusting on top makes it hard to identify these slabs. Of note are the recent skier triggering of mid-slope avalanches.

  • Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.
  • Use caution on steep lee and cross-loaded slopes

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Valid until: Nov 24th, 2021 4:00PM

Forecast Trend

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