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Archived

Avalanche Forecast

Dec 30th, 2020–Dec 31st, 2020
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
4: High
The avalanche danger rating at treeline will be high
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
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: South Coast.

Recent heavy snowfall means that storm slabs will be widespread and are still likely to be triggered by people, especially in wind loaded areas. Continue to choose low-angle terrain.

Confidence

Moderate - Uncertainty is due to how quickly the snowpack will recover and gain strength.

Weather Forecast

WEDNESDAY NIGHT - Snow, mixed with rain at times, 15-20 cm / southwest wind, 40-60 km/h / alpine low temperature near -1 / freezing level 1000 m 

THURSDAY -Mainly cloudy / light northwest wind / alpine high temperature near 0 / freezing level 1200 m 

FRIDAY - Snow, mixed with rain, 50 cm or 50 mm of rain / southwest wind, 60-80 km/h / alpine high temperature near 1 / freezing level 1600 m

SATURDAY - Snow, mixed with rain, 75 cm or 75 mm of rain / southwest wind, 70-90 / alpine high temperature near 1 / freezing level 1500 m 

Avalanche Summary

Recent fresh snow with strong winds will mean that the likelihood of avalanches remains elevated on Thursday, in spite of the drier weather. 

There were numerous avalanches up to size 1.5 reported in the North Shore mountains during the storm on Wednesday. It is likely that a widespread natural avalanche cycle occurred throughout the region on Wednesday as well, especially at higher elevations.

Many thanks for all of the great MIN report submissions on Wednesday!

Snowpack Summary

The South Coast received up to 60 cm of new snow with moderate to strong winds between Tuesday evening and Thursday morning. This new snow sits on a crust in many areas, and may also sit on surface hoar in some places. The new snow may take longer than usual to gain strength if these weak layers are present.

Around 100-150 cm of snow now overlies a hard melt-freeze crust up to around 1500 m. The depth of this layer varies greatly due to the wind transport of snow as it fell over the last two storms. It seems to be bonding well with the surrounding snow.

The remainder of the snowpack is well-settled.

Terrain and Travel

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Avoid freshly wind loaded terrain features.
  • Be aware of highly variable recent wind loading patterns.

Avalanche Problems

Storm Slabs

Up to 60 cm of snow fell in the region between Tuesday night and Thursday morning. Strong winds from a variety of directions will mean that storm slabs are likely to be encountered on all aspects and may remain reactive to human triggering on Thursday. The new snow may sit on a weak layer of either surface hoar or a crust, which may mean that it remains reactive for longer than usual.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2