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Archived

Avalanche Forecast

Dec 17th, 2017–Dec 18th, 2017
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
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
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: Glacier.

Conditions are changing quickly. With heavy snowfall expected today, storm slabs will become touchy!

Weather Forecast

Snow is on the way!! Today we can expect 10cm with another 10-15 tonight. Ridgetop wind will be from the SW at 20kph with freezing level up to 800m.  Monday we will see the precipitation ease before another weather system brings moderate precip to Rogers Pass Tuesday.

Snowpack Summary

15cm of new snow fell in the last 48 hrs burying the Dec15th interface. This layer is the one to watch develop. It is widespread surface hoar found at all elevations and is LARGE (30-40mm) in sheltered areas at treeline. The new snow also buries crusts on S & W aspects and windslab in the alpine. The Nov crusts, buried down ~70cm are bonding well.

Avalanche Summary

Reports yesterday came in of a skier triggered sz 1 storm slab on the fan of Cheops North 5. It propagated 50m wide and was up to 30 cm deep. Expect to see more avalanches like this but larger as we get more snow or the new settles into a slab on the Dec 15th surface hoar.

Confidence

Intensity of incoming weather systems is uncertain on Sunday

Avalanche Problems

Storm Slabs

After a long dry spell, 15cm of new snow has fallen on widespread surface hoar. Another 25 is expected today! As this new snow settles into a cohesive slab, expect to see avalanche hazard spike! Also expect sluff to be heavy and fast!
Be cautious of sluffing in steep terrain.Use caution in alpine and open treeline lees. Recent snowfall has created storm slabs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 3