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Archived

Avalanche Forecast

Apr 8th, 2018–Apr 9th, 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
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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Look for pockets of storm slab on lee features. Watch for an increasing avalanche danger on solar aspects if the sun comes out.

Weather Forecast

A mix of sun and cloud with light west winds, alpine high of -4C freezing levels rising to 1800m this afternoon. Freezing levels are expected to rise to 2000m by Tuesday with little overnight recovery.

Snowpack Summary

15cm of storm snow sit on top of a sun crust on solar aspects. 20-25cm of low density powder remains on shaded aspects. Wind slabs are above treeline in lee features. 60cm of recent storm snow is settling out and appears to be bonding well on polar aspects. On solar slopes, the storm slab sits on a persistent crust.

Avalanche Summary

Thursday strong solar input contributed to a widespread natural avalanche cycle on south facing slopes. Several large solar triggered avalanches occurred including Frequent Flyer. Friday there were five avalanches to size 3 recorded in the highway corridor. Yesterday no new natural avalanches were observed.

Confidence

Timing or intensity of solar radiation is uncertain

Avalanche Problems

Storm Slabs

A layer of storm snow sits over windslab at and above treeline. Watch for wind loading in lee features. Expect these pockets around cornices, wind lips and roll overs. Solar input and a warming trend today may wake surface layers on S'ly aspects.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5

Persistent Slabs

70-90cm of settled snow sits on the mid March crust/facet combo. This layer appears to be bonding well on polar aspects. On solar aspects, this layer fails suddenly in stability tests and has shown potential for wide propagation if triggered.
Be aware of the potential for wide propagations which could result in large avalanches.Avoid convexities and thin snowpack locations.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3