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Archived

Avalanche Forecast

Apr 23rd, 2017–Apr 24th, 2017
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
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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
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
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Minimal crust recovery overnight, and warm temperatures and sun in today's forecast will contribute to a continuing avalanche cycle. Beware of loose avalanches and avoid being near or under cornices.

Weather Forecast

A mix of sun and cloud for today with warm above freezing temperatures pushing higher than the forecast 1800m freeze line. Unsettled weather on Monday with snow flurries and freezing levels at 1700 meters. The trend for the upcoming week is for slowly falling freezing levels and flurries.

Snowpack Summary

On high northerly aspects a deep winter snowpack prevails. Elsewhere the spring snowpack continues to develop with numerous melt-freeze crusts. At middle and low elevations the snowpack is becoming isothermal.

Avalanche Summary

Numerous avalanches were observed along the highway corridor yesterday from size 2.0 to size 3.0. Most were triggered in loose snow which then gouged deeper at lower elevations and became larger avalanches. Cornices were falling and triggering slab avalanches in drier snow at higher elevations and Northerly aspects.

Confidence

Timing or intensity of solar radiation is uncertain on Sunday

Avalanche Problems

Loose Wet

At treeline and below warm temperatures have prevented solid crust formation overnight, resulting in weak wet surface snow that slides easily on crusts below. Steep solar aspects in the alpine are producing significant loose wet avalanches as well.
Use extra caution on slopes if the snow is moist or wet.Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

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

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3

Persistent Slabs

Slab avalanches, the remnants of previously storm and wind deposited snow, are possible though difficult to trigger.
Test slopes before committing to them.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Cornices

Large cornices are widespread on high northeasterly ridge lines. With high freezing levels and periods of sun these may fail, triggering deep persistent slab avalanches.
Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.Avoid travel on slopes that are exposed to cornices overhead.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3