Avalog Join
Archived

Avalanche Forecast

Jan 22nd, 2020–Jan 23rd, 2020
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
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: North Rockies.

New snow falling with wind and warm temperatures will continue to promote wind slab formation in exposed terrain over the next few days.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

WEDNESDAY NIGHT: Cloudy with clear periods, moderate wind from the southwest, alpine high temperatures around -4 C.

THURSDAY: Flurries, accumulation 5-15 cm, moderate wind from the southwest, freezing level up to 1500 m and alpine high temperatures around -2 C.

FRIDAY: Scattered flurries, moderate to strong wind from the southwest, freezing level up to 1600 m and alpine high temperatures around -2 C.

SATURDAY: Mainly cloudy, moderate to strong wind from the southwest, freezing level up to 1500 m and alpine high temperatures around -3 C.

Avalanche Summary

On Monday there were reports of numerous natural wind slab and cornice triggered avalanches running to size 2 in the alpine on a variety of aspects. See this MIN post for more details.

There have also been a number of glide cracks that failed naturally as very large avalanches in the Torpy area recently. Glide cracks are seemingly unpredictable and need to be given a wide berth. There are some great photos on the PGBCSki FB page. Mild temperatures this week could increase the sensitivity of persistent and glide slabs.

Snowpack Summary

Recent snow has settled with warm temperatures and been blown around by wind from various directions, resulting in wind slabs on all aspects at and above treeline. A weak layer of surface hoar buried in late December remains a concern. The layer has been found across much of the North Rockies region, but it has only become a problem in particular areas, such as around McBride and the McGregors/Torpy. It seems to be most prevalent in sheltered treeline features 50 to 150 cm below the surface.

Terrain and Travel

  • Avoid steep slopes when air temperatures are warm, or solar radiation is strong.
  • Be careful as you transition into wind affected terrain.
  • Seek out wind sheltered terrain below treeline where you can avoid wind slabs and find great riding.

Avalanche Problems

Wind Slabs

Recent wind from a variety of directions has formed wind slabs in places we aren't used to seeing them. Watch for wind slabs in all wind exposed terrain. 

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

A weak layer of buried surface hoar may be found in parts of the region. There is uncertainty on where this layer is a problem, but it appears to be of highest concern in sheltered terrain features near treeline in the southern half of the region, particularly around McBride and the McGregors.

Aspects: All aspects.

Elevations: Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3