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Archived

Avalanche Forecast

Apr 8th, 2017–Apr 9th, 2017
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
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Highway avalanche control is scheduled for today.  For those venturing into the backcountry, watch for increased avalanche hazard with daytime warming and periods of strong spring sunshine.

Weather Forecast

As a blocking high pressure ridge builds off shore, we get a break from precipitation.  Expect a mix of sun and cloud today and isolated flurries with trace amounts of accumulation. Ridge winds will be SW 15-30km/h and freezing levels will rise to 1600m.

Snowpack Summary

10cm of new snow fell overnight with strong southerly winds.  Below the new snow lies 30cm of moist snow with several embedded temperature crusts.  Deeper in the snowpack, old persistent weak layers that include crusts and facets have been reactive to large triggers like cornices

Avalanche Summary

Three size 2-2.5 moist/ wet natural avalanches were observed in the highway corridor yesterday.  Reports were received from surrounding areas of natural and skier triggered loose wet avalanches at lower elevations, failing on recently buried temperature  crusts.

Confidence

Avalanche Problems

Storm Slabs

30cm of moist snow overlies a crust everywhere other than high elevation N'ly aspects. Winds have been shifting directions and will have formed deeper pockets on lee slopes. Rising freezing levels and continued loading will make them more reactive.
Choose well supported terrain without convexities.Watch for shooting cracks or stiffer feeling snow. Avoid areas that appear wind loaded.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Persistent Slabs

Cornices dropping and smaller avalanches have recently triggered deep, persistent weak layers. The resulting avalanches have been observed to run well into the valley bottoms. With continued loading during the storm likelihood will increase.
Space out and travel quickly through runout zones of avalanche paths.Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Loose Wet

At treeline and below, rain has saturated the snow that overlies a series of crusts. Warm temps are keeping the snow weak. Today's solar input will increase this hazard. This wet snow will be easily triggered and will run far on the crust.
Use safe ski cutting techniques before entering ski run. Ski short pitches and regroup in safe spots.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3