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Archived

Avalanche Forecast

Apr 30th, 2014–May 1st, 2014
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
4: High
The avalanche danger rating below treeline will be high
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
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
1: Low
The avalanche danger rating in the alpine will be low
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

Regions: Banff Yoho Kootenay.

There will not be a strong freeze tonight - skies will be cloudy with some clear periods and freezing levels will only dip to approximately 2500 m.  Crusts will not form well tonight and will break down early.

Weather Forecast

There will not be a strong freeze tonight.  Freezing levels will only dip to 2500 m for a short period tonight and a slight temperature inversion is expected.  Thurs will be cloudy with some sun alpine temps of 10-14C &  showers/flurries move in overnight. Friday temperatures will drop through the day, with 5-10 cm/day forecasted for Fri/Sat & Sun.

Snowpack Summary

A solid melt freeze crust to exists up to 2400 m, a little lower on North aspects. Dry uncrusted snow with up to 10cm of settled powder exists only steeper North aspects. Isolated, small windslabs exist in leeward areas in the high alpine. Crusts will not be as strong Thursday with a lack of overnight freeze and a slight inversion forecasted.

Avalanche Summary

Several loose snow avalanches to size 2.5 pouring off cliffs with sun affect as early as 8 am.

Confidence

Avalanche Problems

Deep Persistent Slabs

Without a good freeze tonight and warm temps on Thursday, it would not be a surprise to see the odd large avalanche on this layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 3 - 4

Loose Wet

Expect loose avalanches in steep sun affected terrain initiating from cornice failures or snow falling off cliffs/rocks.
Watch for clues, like sluffing off of cliffs, that the snowpack is warming up.

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

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3