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Archived

Avalanche Forecast

Feb 24th, 2018–Feb 25th, 2018
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Widespread wind slab exists in the Alpine. This is still possible to trigger in unsupported terrain features. Avalanche hazard will increase with incoming snow Sunday.

Weather Forecast

A weak ridge of high pressure will move over Rogers Pass bringing dry, cool conditions and a mix of sun and cloud. Ridgetop wind will be Westerly in the 20-35 range and the alpine high will be around -14 deg C. A low approaching from the NW will bring precip that starts tonight and ends Sunday afternoon, 10-20cms are forecast by Sunday evening.

Snowpack Summary

Cold temps promoting facetting of the upper snowpack. Previous strong northerly and recent moderate southerly winds have added to the growth of cornices. Windslab can be expected in the alpine and exposed areas into treeline. On solar aspects, a crust is buried 40cm. Persistent weak layers from January and December are now buried 150-200cm.

Avalanche Summary

No new natural avalanches observed in the past few days. Several artillery controlled slab avalanches to size 2.0 on Thursday during a target verification shoot. Skier controlled size 2.5 wind slab on Mt. Sifton several days ago. Several cornice failures earlier this week up to size 2.5.

Confidence

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

Avalanche Problems

Wind Slabs

Previous strong northerly and recent moderate southerly winds formed windslab in the alpine and treeline. Natural slab avalanches to size 2 occurred earlier this week, many triggered by cornice fall. Avoid exposing yourself to overhead hazard.
If triggered the wind slabs may step down to deeper layers resulting in large avalanches.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 2.5