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Archived

Avalanche Forecast

Apr 13th, 2014–Apr 14th, 2014
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
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Kootenay Boundary.

Avalanche danger can rise very quickly with warming and solar radiation. Be aware of changing conditions and overhead hazards. Terrain choices and timing can be critical.

Confidence

Good

Weather Forecast

Tonight and Monday: The ridge of high pressure bringing clear and warm conditions remains over the province. Clouds will start building as a low pressure system approaches during the day. Expect freezing levels to be near 2500 m and light North West winds. Tuesday: A trace of precipitation is forecasted with light North West winds, freezing levels going from 1200 m at night and rising to 1500 m during the day.  Wednesday: Mainly cloudy, a possibility of light precipitation, freezing levels around 1700 m.

Avalanche Summary

No new avalanches reported.

Snowpack Summary

Melt-freeze cycles has created a hard crust at the surface in most places. During the day, this crust is broken down by warm temperatures and solar radiation on all aspects up to around 2200 m and above this elevation on solar aspects. Snow stability will decrease quite rapidly as the day progresses tomorrow, increasing the chance of cornice fall and wet loose avalanches. The late January/early February persistent weak layer is deeply buried, and has not produced avalanches in this region for some time now. However, tomorrow's intense warming and solar radiation could wake up the deep weak layer in isolated areas, like on higher alpine slopes that have not gone through such a heat shock. I suspect this would be more the case in the Northern part of the region.

Avalanche Problems

Loose Wet

Periods of intense solar radiation or pronounced warming will likely result in some loose wet activity, especially on steep south facing slopes.
Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.>Watch for clues, like sluffing off of cliffs, that the snowpack is warming up. >

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3

Deep Persistent Slabs

Areas and features that have not seen such a heat shock could be prone to deep slab avalanches tomorrow with the forecasted intense warming and solar radiation.
Be aware of the potential for large, deep avalanches due to the presence of buried persistent weak layer.>Minimize exposure to sun exposed slopes when the solar radiation is strong.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 5