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Archived

Avalanche Forecast

Jan 13th, 2021–Jan 14th, 2021
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
4: High
The avalanche danger rating in the alpine will be high
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
4: High
The avalanche danger rating in the alpine will be high
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

Regions: Northwest Coastal.

Storm slabs are expected to continue to be reactive with ongoing flurries and strong to extreme southwest winds. Look for low-angle slopes in wind sheltered terrain for the best, and safest riding conditions.

Confidence

Moderate - Uncertainty is due to the fact that persistent slabs are particularly difficult to forecast.

Weather Forecast

WEDNESDAY NIGHT - Mainly cloudy with isolated flurries / southwest wind, 20-30 km/h / alpine low temperature near -8 

THURSDAY - Flurries, 5-10 cm / southwest wind, 60-80 km/h gusting to 100 km/h / alpine high temperature near -3 / freezing level 1000 m

FRIDAY - Snow, 10-20 cm / southwest wind, 50-70 km/h / alpine high temperature near -2 / freezing level 1000 m

SATURDAY - Flurries, 10-15 cm / south wind, 30-60 km/h / alpine high temperature near -3 / freezing level 800 m

Avalanche Summary

With continued snow and moderate southwest wind, avalanches will likely remain easy to trigger on Thursday, especially in wind loaded areas.

There was a natural avalanche cycle reported on Tuesday, as well as numerous explosives triggered avalanches up to size 2.5 and a few human triggered size 1 avalanches.

On Monday, there were reports of widespread natural and explosives triggered avalanches up to size 3. The largest avalanches were reported in the north of the region where there has been more recent snow. The avalanches being reported closer to Terrace were generally in the size 1-2 range.

There were a few natural and explosives triggered storm slab avalanches size 1-2.5 reported in the region on Sunday.

Snowpack Summary

5-10 cm in the forecast for Thursday will bring recent storm snow totals to between 50-80 cm.

In the Shames area, a weak layer of surface hoar has been reported in sheltered areas down around 100-160 cm. 

A bit further north in the Nass/Sterling/Beaupre areas, there is potentially still concern about an older weak layer overlying a crust that is now roughly 160-180 cm deep. 

In the far north of the region, there is concern about weak snow at the bottom of the snowpack.

Terrain and Travel

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Avoid freshly wind loaded terrain features.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.

Avalanche Problems

Storm Slabs

Storm slabs are expected to be widespread and are likely still easy to trigger, especially in wind loaded areas.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1.5 - 2.5

Persistent Slabs

There are a few different persistent weak layers being reported throughout the region. They are all generally buried between 100-200 cm and tend to consist of either surface hoar or crusts with faceted snow sitting on them.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3