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Archived

Avalanche Forecast

Apr 19th, 2018–Apr 20th, 2018
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Best to get an early start before temperatures rise and the sun starts to deteriorate the upper snowpack. Avoid steep south and west facing terrain this afternoon.

Weather Forecast

Finally a spring day! Weather should remain mostly clear today, FL will reach 1800m, but the solar effect will be felt much higher on solar aspects. Winds will remain light from the North and no precipitation. Friday afternoon we should see a change with 18mm of precipitation expected by late Saturday afternoon with strong westerlies.

Snowpack Summary

Warm temps yesterday and a clear night will leave us with a mod refreeze this am. Expect typical spring conditions (melt freeze) on all aspects and elevations except North and East in the Alpine and upper treeline, where there are still winter storm slabs lurking in steep exposed areas. April 7th Cr is now down 50-70cm and still a concern.

Avalanche Summary

Yesterday we observed 2 avalanches in the HWY corridor. 1 loose moist in Gunners Slide path and 1 slab avalanche in Pioneer, both size 2. Also a report of a size 2 storm slab skier controlled in Cheops North # 4. Several glide cracks are opening up and are on the verge of failing, it's best to give these hazards a wide berth.

Confidence

Due to the number of field observations

Avalanche Problems

Loose Wet

Loose wet avalanches can be expected as daytime warming and solar radiation pushes freezing levels upwards of 1800m. Expect surface snow layers to be moist and reactive this afternoon.
Daytime warming will weaken surface layers.Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

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

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3

Storm Slabs

Storm slabs are possible on North and East aspects in the Alpine and exposed areas of treeline. These slabs will be most susceptible to triggering in steep unsupported terrain, near ridge crests where wind loaded.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Use caution in lee areas in the alpine and treeline. Storm snow is forming slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2