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Archived

Avalanche Forecast

Apr 14th, 2022–Apr 15th, 2022
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
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
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Yukon.

Avalanche conditions are generally safe. Things to always think about are pockets of wind slabs in steep alpine terrain, the possibility of cornice failure, and snowpack warming when the sun is out.

Confidence

High - Confidence is due to a stable weather pattern with little change expected.

Weather Forecast

THURSDAY NIGHT: Mainly clear, some high cloud. Light wind from the northwest. Treeline temperatures drop to -15 C.

FRIDAY: High cloud increasing in the afternoon. 10-30 km/h wind from the west. Treeline temperatures rise to -8 C.

SATURDAY: Cloudy with light flurries. Light variable winds. Treeline temperatures rise to -10 C.

SUNDAY: Cloudy with light flurries. Light southerly winds. Treeline temperatures around -12 C.

Avalanche Summary

A very large cornice-triggered wind slab avalanche (size 3) was observed near White Pass on Tuesday. This avalanche occurred on an east aspect in the alpine.

Several small human-triggered wind slabs (size 1) were reported during the outflow wind event on Monday and Tuesday. 

Looking forward, avalanche activity is unlikely given the current cool, unsettled weather trend. However, always be ready for the possibility of pockets of wind slabs in steep alpine terrain, cornice failures, and wet loose avalanches if the sun is out.

Snowpack Summary

Earlier in the week, strong northerly wind hammered the region, leaving sastrugi and hard wind-affected snow on the surface. Sun crusts are found up to 1400 m on south and west-facing slopes, while surfaces on other aspects are dry. The mid-snowpack is generally strong, overlying weak basal facets at the base of the snowpack. 

Check out the Yukon Field Team's MIN from Wednesday for a picture of current conditions!

Terrain and Travel

  • Make observations and assess conditions continually as you travel.
  • Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Avalanche Problems

Cornices

Cornices are large this time of year and may have been weakened by recent cold temperatures. Exposure to cornices should be minimized, especially during periods of warm temperatures or strong sun. Give them a wide berth when you are travelling on ridge lines and avoid overhead exposure to large cornices. 

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1.5 - 3