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Archived

Avalanche Forecast

Feb 4th, 2017–Feb 5th, 2017
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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: Lizard-Flathead.

New snow is creating touchy storm slabs: It's time to rein in your terrain choices and stick to simple, no consequence terrain. Avoid all overhead hazard as well - avalanches have already been running to valley bottom.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

Significant snowfall through to Monday afternoon. SUNDAY: Periods of snow, accumulation 25-40cm by day's end / Light to moderate southeast wind / Alpine temperature -7MONDAY: Flurries, accumulation 10-20cm / Light to moderate southwest wind / Alpine temperature -12TUESDAY: Scattered flurries / Light southwest wind / Alpine temperature -10

Avalanche Summary

As of Saturday afternoon we've reached the tipping point with the new snow: Touchy storm slabs (10-40cm thick) are forming (on southeast through north aspects in the alpine) resulting in natural avalanches to Size 2. The size of natural avalanches is expected to increase and the distribution expected to be widespread by Sunday afternoon: It's time to seriously dial back the terrain use and stick to simple, no consequence terrain.

Snowpack Summary

Anywhere from 15-30cm of new, low-density snow sits on previous surfaces that may include heavily wind affected snow, surface hoar in sheltered areas and/or facets. By Saturday afternoon the new storm snow was forming slabs and running naturally on northerly aspects in the Corbin zone. Crusts can be found near the previous surface on solar aspects at high elevations and on all aspects below 1600m. The hard windslabs below the recent storm snow have not bonded well to the previous surface and are easy to trigger in isolated lee and cross-loaded features. About 70cm below the surface, you'll find sugary facet crystals which formed during December's cold snap. Although avalanches are currently unexpected at this interface, this layer could come back to life with with warming, significant loading or a large trigger at a thin spot.

Avalanche Problems

Storm Slabs

The size and distribution of natural storm slab avalanches will increase significantly by Sunday afternoon. Avoid all avalanche terrain.
Be aware of the potential for avalanches due to buried surface hoar in isolated areas.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 3