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Archived

Avalanche Forecast

Apr 19th, 2014–Apr 20th, 2014
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
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: Jasper.

The avalanche hazard will rise on slopes with prolonged exposure to the sun.  Plan to travel early to take advantage of the crust and be off big slopes by mid-day.

Weather Forecast

Cloudy conditions through Sunday with gusty SW winds and little precipitation expected.  A cold overnight low on Sunday night will significantly recover the melt freeze crust from treeline to valley bottom.  Sunny warm conditions on Monday and a significant rain event expected on Tue/Wed.  The avalanche danger will rise accordingly.

Snowpack Summary

The crust that formed Fri. night was starting to break down on solar aspects below treeline by Sat. PM, elsewhere it stayed intact.  Cloudy conditions overnight may prevent a strong crust from reforming.  Generally the snowpack is; moist snow below the crust to TL, well bonded and warm mid-pack, and a weak faceted base. Cornices are large.

Avalanche Summary

No new avalanche observed today.  Recent slab activity has been observed on SW aspects at treeline on the Feb 10th layer. loose dry out of steep SW rocky alpine features and loose wet on solar aspect at treeline and below.

Confidence

Timing or intensity of solar radiation is uncertain on Sunday

Avalanche Problems

Loose Wet

Little overnight recovery of the melt freeze crust is expected.  Loose wet slides are possible by mid-day especially if exposed to intense solar radiation.
Start and finish early before the surface crusts melt.Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

No recent activity on this layer however triggering may be possible from thin rocky areas on loaded features.
Be aware of thin areas that may propogate to deeper instabilites.Avoid convexities or areas with a thin or variable snowpack.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3