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Archived

Avalanche Forecast

Dec 30th, 2014–Dec 31st, 2014
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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
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
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

Regions: Northwest Inland.

Confidence is poor due to wildly variable wind slabs and a forecasted Above Freezing Layer that suggests we may not get a refreeze between 1500m and 2800m until Thursday afternoon.

Confidence

Poor

Weather Forecast

Synopsis: Arctic air is now dominant over all of coastal BC. Warmer air riding up and over the arctic air has created an above freezing layer that should stick around through Thursday afternoon. Looks like a significant storm will make landfall Thursday night continuing into Friday.Wednesday: Freezing Level: Valley Bottom, potential AFL 1000 to 2500m; Precipitation: Nil; Wind: Treeline: Moderate, NW | Ridgetop: Strong, NW.Thursday: Freezing Level: 800m, Precipitation: trace; Wind: Treeline: Moderate W/SW | Ridgetop: Extreme, SW.Thursday Night: Precipitation: 10 to 15mm | 10 to 20cm.Friday: Freezing Level: 800m; Precipitation: 2 to 5mm | 2 to 10cm; Wind: Treeline: Strong, SW | Ridgetop: Extreme, W

Avalanche Summary

No new avalanche activity from this region to report. In the neighboring NW Coastal region on Tuesday wind and storm slabs to size 2.5 ran on NW, SW and SE facing aspects between 1500 and 2000m

Snowpack Summary

Strong outflow winds on Dec. 28 left a variety of wind affected conditions in their wake in wind exposed terrain at all elevations. You will likely find wind pressed snow on north aspects, thicker wind slabs on south facing features and some degree of crossloading on everything else.A layer of buried surface hoar down about 30-50 cm appears to be spotty in distribution, but may still be a concern in some areas. Near the base of the snowpack, the mid-November crust-facet layer has become less likely to trigger, but is still in the back of our minds.Look for a revised snowpack discussion on Wednesday.

Avalanche Problems

Wind Slabs

Outflow winds left the biggest wind slabs on south facing features, but slabs of varying thickness/hardness will be found on all wind exposed slopes. 
Be aware of the potential for wide propagations due to the presence of hard wind slabs.>Seek out wind sheltered terrain for the next few days until wind loaded slopes have had a chance to stabilize.>Stay off recent wind loaded areas until the slope has had a chance to stabilize.>

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

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 3