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Archived

Avalanche Forecast

Nov 4th, 2020–Nov 5th, 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
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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.

While Winter is just starting, we have already seen numerous large avalanches. Avalanche paths like frequent flyer and Cheops Nth4 have the potential to run full path! Try and always be cognisant of overhead hazards when traveling at valley bottom.

Weather Forecast

Low pressure systems are tracking across BC from the Pacific, bringing warm temperatures, and continued precipitation until Friday morning.

Today:15cm of snow in the Alp, 15mm of rain at TL and BTL, mod SW wind, gusting to 70km from the SW and FL rising to 2600m.

Tonight: 25cm of snow in the Alp, 25mm of rain at TL and BTL.

Thursday: 10cm new snow.

Snowpack Summary

Alpine: Height of snow is above average on lee terrain features, and well below on scoured windward areas. Storm slabs continue to build

Treeline: The snowpack is shrinking with rain on snow conditions.

Below Treeline: The height of snow varies from 40cm at HWY elevation, to 70cm. Expect rain soaked snow, and isothermal conditions at this elevation.

Avalanche Summary

A few loose wet avalanches were observed yesterday in the HWY corridor, to size 2.5 in extreme terrain (Macdonald Gully #7, and Tractor Shed East). Natural avalanches are possible today, and human triggered avalanches are likely. The avalanche cycle will peak tonight and tomorrow, with continued precipitation, warm temperatures and strong winds.

Confidence

Due to the quality of field observations

Avalanche Problems

Loose Wet

Rain continues to soak an already isothermal snowpack. Expect small loose wet avalanches in steep terrain features.

  • Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Storm Slabs

Storm slabs continue to develop today, we are expecting a peak in the avalanche cycle tonight and tomorrow. Human triggering is likely today on steep, unsupported terrain features.

  • Use caution in lee areas. Wind loading could create slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5