Archived

Avalanche Forecast

Apr 14th, 2015–Apr 15th, 2015

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

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

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

1: Low

The avalanche danger rating below treeline will be low

Regions: Glacier.

Conditions have been touchy at tree line and above. We've had new snow these past few days with some steady winds over a surface hoar layer. Keep to conservative terrain until it settles out.

Weather Forecast

Cloudy with light snow most of today with possible clearing this afternoon as higher pressure builds over the region. Freezing levels to remain around 1450m. Light to moderate southwest alpine winds. Skies are to clear this evening with a good overnight freeze. No precipitation expected for tomorrow with increasing cloudiness in the afternoon.

Snowpack Summary

Up to 50cm of recent storm snow. The storm layer sits atop a crust on solar aspects and surface hoar on sheltered north and east aspects. Wind effected snow at treeline and above. The upper 40-50cm of the snowpack is dry above 1700m with moist snow below it. Multiple crusts in the top 1.5m of the snowpack over well settled snow.

Avalanche Summary

1 size 2.0 natural avalanche and 1 size 2.0 natural cornice release yesterday in the highway corridor east of the Rogers Pass summit. From two days ago, skiers triggered slab avalanches to size 1.5 in the Tree Triangle gully, ~2000m, 30-40cm deep, 20m wide and 75m long

Confidence

Timing or intensity of solar radiation is uncertain

Avalanche Problems

Storm Slabs

40cm of recent storm snow sits over surface hoar on northerly aspects. Associated winds with the storms have been enough to create slabs in exposed areas. Its time to select more conservative terrain.

Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Loose Wet

The sun may come out later today. With all the new snow we've had, it won't take much to kick off some loose avalanches on solar aspects.

Aspects: North, North East, East.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2