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Archived

Avalanche Forecast

Apr 14th, 2012–Apr 15th, 2012
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
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Northwest Inland.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

The region will see a mix of sun and cloud on Sunday with light to moderate southwesterly winds and freezing levels at about 1600m. Monday will see light precipitation with generally overcast skies on Tuesday. Winds will be light to moderate /southerly on Monday, switching to light/variable by Tuesday. Freezing levels are expected to remain at 1900m on Monday dropping to 1300m by Tuesday.

Avalanche Summary

No new avalanches were reported from this region.

Snowpack Summary

We have had very little information about the snowpack in this region for several days now. However, I suspect the light snowfall with light winds at higher elevations have created a fairly consistent covering over a variety of old surfaces. These surfaces include well settled powder on steep north-facing slopes, and temperature-affected snow on solar aspects up high and on all aspects at lower elevations. Below the snow line I suspect light rain has been penetrating and weakening already wet snow. As we head deeper into spring, expect potentially potent, yet relatively short-lived, instabilities with each storm. Melt-freeze cycles are the most likely conditions you'll encounter. If temperatures go below freezing, moist or wet snow surfaces may develop crusts that will strengthen the snowpack. During periods of warming, rain or direct solar radiation, crusts will break down and pushy and destructive wet slabs and wet loose snow avalanches will become a real possibility. In short, warming is the most likely condition that will create an increased avalanche danger at this time of year, especially if there is a minimal amount of overnight freeze. Expect cornices to be large and potentially unstable, especially under sunny skies.

Avalanche Problems

Loose Wet

Snow stability can deteriorate very quickly with spring temperatures. Watch for loose wet avalanches on steep terrain, especially if the sun is shining.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 5

Wet Slabs

Snow stability can deteriorate very quickly with spring temperatures. Wet slabs also include glide cracks and are most likely triggered during periods of sun, rain or warm temperatures.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 5

Cornices

Large cornices exist in alpine terrain. A failure could be destructive by itself, and could also trigger an avalanche on the slope below.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 5