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Archived

Avalanche Forecast

Apr 13th, 2018–Apr 14th, 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
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
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: Kananaskis.

New windslabs have/are developed in alpine terrain that skiers should pay close attention too. Choose supported features and rein yourself in a little.  Watch for the affects of solar radiation on solar aspects later in the day.

Confidence

High -

Weather Forecast

Winds out of the SW are forecast to increase overnight further loading and building on the current windslabs.  Conditions will be a mix of sun and cloud with daytime highs are -7C in the alpine.  Pay attention to the sun, solar radiation is strong at this time of year and solar aspects will quikly become less stable as temperatures warm up.  These decreases will be most apparent in thin, steep, rocky solar terrain.

Avalanche Summary

One size two wet slab was observed on the EEOR later in the day on Friday but otherwise, only isolated pinwheeling on solar aspects.

Snowpack Summary

SW winds increased in alpine overnight and into the morning building windslabs up to 20cm thick in lee features. Recent snow is overlying a supportive MFC that is 4-6cm thick up to 2200m. All aspects were moist up to 2000m by midday and moist snow suspected up to the peaks on solar. Hard sudden planar  results on the March 15th crust down 50cm at 2200m on a SE aspect at treeline.  Start early when travel on the crusts is good and fast

Avalanche Problems

Wind Slabs

Windslabs up to 20cm thick in lee and crossloaded features.  These slabs will build overnight on Friday and get a little bit larger and stiffer.  Use Caution.
Avoid lee and cross-loaded terrain near ridge crests.Give cornices a wide berth when travelling on or below ridges.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

Lots of variability on this interface down 50cm.  This is a persistent slab that is overlying a thick suncrust that was buried on solar aspects on March 15th.
Minimize exposure to sun exposed slopes when the solar radiation is strong.Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2.5

Cornices

Cornices are large and looming and become weak with daytime heating. They may collapse and trigger an avalanche on the underlying slopes.
Cornices become weak with daytime heating, so travel early on exposed slopes.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1.5 - 3