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Avalanche Forecast

Dec 5th, 2017–Dec 6th, 2017
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: South Columbia.

Intense warming is on the way and it's tricky to predict how it will impact the snow. Make conservative terrain choices and avoid sun exposed slopes.

Confidence

Moderate - Freezing levels are uncertain on Wednesday

Weather Forecast

WEDNESDAY: Sunny with valley cloud in the morning, light northwest wind, inversion forming with alpine temperatures reaching -2 C.THURSDAY: Sunny with valley cloud, light wind, inversion with freezing level up to 3000 m.FRIDAY: Sunny with valley cloud, light wind, inversion with freezing level up to 2700 m.

Avalanche Summary

On Tuesday, a large size 3 natural avalanche was reported on a steep north-facing alpine face in the Selkirks. The failure layer is unknown, but it was likely an early season crust. Some sluffing from steep sun-exposed slopes was also reported. Small wind slabs have been reactive to skier traffic on steep convex rolls over the past few days.

Snowpack Summary

The snowpack is about to experience a big change with a week of warm sunny weather ahead. Intense warming is expected on steep south-facing slopes, while dry snow may persist on north-facing slopes. Snow from last week's storms has been redistributed into fresh wind slabs by northwest winds. Roughly 40-80 cm of recent snow sits above crusts from the warm weather in late November. Most reports suggest the snow is bonding to the crusts so far, but there's potential for this layer to become reactive with the intense warming. Snow depths decrease rapidly below treeline, where the primary hazards are rocks, stumps, and open creeks.

Avalanche Problems

Storm Slabs

Storm slabs will become touchy as the snow warms up, especially on steep south-facing slopes. Also watch for wind-loaded slopes on ridges and gullies.
Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.Choose well supported terrain without convexities.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2