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Archived

Avalanche Forecast

Apr 8th, 2018–Apr 9th, 2018
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
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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: Banff Yoho Kootenay.

Be watchful for wind slabs in immediate lee areas at high elevations. Depending on local new snow amounts and wind velocity the slabs could be touchy with wide propagations.

Weather Forecast

The weather is slowly transitioning to a diurnal cycle from the unseasonably cool spring temperatures. Expect above zero temps in the valleys bottoms (~5 degrees) during the warmest parts of the upcoming days. Monday will bring cloudy skies and very light accumulations of snow (~4cm). Wind will pick up to the moderate range from the W-SW.

Snowpack Summary

Up to 15cm in the past 24 hours that has been redistributed by moderate wind from the SW has produced wind slabs in lee areas in the alpine. The March 15 suncrust is down 30-50cm on south-east through west aspects and has been sensitive to skier triggering over the last few days. No major concerns exist below the Mar 15 crust at this time.

Avalanche Summary

A size 2 windslab was observed on a NE aspect at 2600m near Lake Louise today. No other avalanches were observed or reported.

Confidence

Due to the number of field observations on Sunday

Avalanche Problems

Persistent Slabs

Dig down to test the bond to the Mar 15 crust, bearing in mind that the bond can vary significantly with subtle changes in slope aspect and steepness. Forecasters suspect this problem is developing with faceting on the crust due to recent cold temps.
Be cautious with convexities and steep slopes on solar aspects.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5

Wind Slabs

Recent new snow and wind have created new soft wind slabs in immediate lees in the alpine.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2