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Archived

Avalanche Forecast

Apr 26th, 2017–Apr 27th, 2017
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Glacier.

Weather Forecast

Mainly cloudy with isolated flurries and a chance of an afternoon thunderstorm..  Alpine high of -3C, light ridgetop winds and a freezing level edging up to 1800m.  Thursday there is snow to 5cm in the alpine forecast with a freezing level of 1700m.

Snowpack Summary

High elevation N aspects still hold a winter snowpack with surface windslab that may be sensitive to human triggering given the right location. On solar aspects expect temp crusts and sun crusts in morning and moist surface as the day warms. Field trip yesterday showed little recovery in surface crusts until 1900m.  Unsupportive snow below 1700m.

Avalanche Summary

Recent slab releases off of lower slopes of Sir Donald to size 3.  Numerous point releases from the past week at below treeline elevations.  There were human triggered slides on alpine N aspects to size 2 on Sunday.

Confidence

Avalanche Problems

Wind Slabs

Expect to find pockets of windslab on high elevation N aspects formed by recent S-SW winds.  Skiers reported triggering windslab to size 2 on Sunday.
Watch for whumpfing, hollow sounds, and shooting cracks.Use caution in lee areas. Recent wind loading has created wind slabs.

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Loose Wet

Poor overnight crust recovery at low elevations last night. Surface crust breakdown can be expected with daytime warming.  Wet slides may occur later in the day.
Use extra caution on solar slopes or if the snow is moist or wet.Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.

Aspects: North, North East, East, South East, South, South West, West.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Cornices

Cornices are huge and hanging over alpine lee slopes in many places.  Daytime warming may promote failure of these large triggers.  Cornice failure may wake persistent weak layers.
Pay attention to overhead hazards like cornices which could trigger slabs.Pay attention to overhead hazards like cornices which could trigger the deep persistent slab.

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3