Archived

Avalanche Forecast

Dec 6th, 2014–Dec 7th, 2014

Alpine

2: Moderate

The avalanche danger rating in the alpine will be moderate

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

2: Moderate

The avalanche danger rating in the alpine will be moderate

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

2: Moderate

The avalanche danger rating in the alpine will be moderate

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: Glacier.

Keep an eye on the temperatures and type of precipitation that falls today and manage the terrain you are on or exposed to accordingly. Above 0 temperatures and rain falling will deteriorate the integrity of the upper snowpack.

Weather Forecast

Pacific frontal system moves in over the interior today bringing light to moderate snow with milder temperatures. A band of warm air aloft moving across the interior has created a temperature inversion nearing 0 degrees at 2000m. There is the possibility of freezing rain today. Winds are forecast to be light to moderate from the SW.

Snowpack Summary

5-10cm of light snow has buried the latest surface hoar layer. On steep solar aspects this layer formed a sun crust. The Nov 21 and Nov 9 persistent weak layers are buried down ~100 and ~130cm and are less reactive. The failure character of these layers is still sudden planer in snowpack tests. Breakable crust below ~1600m.

Avalanche Summary

No new avalanches were observed yesterday.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Persistent Slabs

Trigger points for the persistent weak layers buried down ~1m and ~1.3m include steep alpine terrain, thin areas, and unsupported open slopes.

Be aware of thin areas that may propogate to deeper instabilites.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3