Yukon Avalanche Forecast

Issued: Apr 30th, 2021 4:00PM

Sat May 1st Current Conditions
Alpine Moderate Treeline Moderate Below Treeline Below Threshold
Sun May 2nd 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Below Threshold
Mon May 3rd 3 Day Outlook
Alpine Moderate Treeline Low Below Treeline Below Threshold

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is below threshold. Known problems include Loose Wet, Wind Slabs and Cornices.

We've had rain at Fraser and freezing levels have been difficult to track in White Pass over the last 24hrs. Rain likely turns to snow at upper elevations and reactive Wind Slabs could be present in the high alpine.

Summary

Confidence

Moderate - Uncertainty is due to difficult to forecast freezing levels.

Weather Forecast

FRIDAY NIGHT: -2C, wind S/SW 20km/hr, cloudy, 3cm of sleet at valley bottom, 5cm snow in the Alpine. Freezing level 1500m

SATURDAY: low -2C high 2C, wind S/SW 10km/hr, broken skies, light precipitation ending around noon

SUNDAY: low -2C high 3C, wind variable 10km/hr, broken skies, trace precipitation

MONDAY: low -6C high 4C, wind N/NE 10km/hr, scattered clouds

Avalanche Summary

Wet snow now overlies firm surfaces. In some places, this wet snow is not sticking well. Check out this MIN for more details. 

Wet loose avalanches up to size 2 have been observed throughout the region.

These types of avalanches will continue until we once again see below freezing temperatures overnight.

A big THANK YOU to all of you that provided us and fellow recreationists with observations this season. Please continue to do so if you head out!

Snowpack Summary

White Pass has now received over 24hrs of light rain and sleet at highway elevations. This has been accompanied by high freezing levels. This has contributed to the snowpack at lower elevations trending to isothermal and unsupportive. Above 1500m, the snowpack remains supportive to travel and dryer snow likely exists. 

The lower snowpack in White Pass is deep for this time of year with no layers of concern. Areas further inland, such as the Wheaton Valley, may have a shallower and weaker snowpack.

Cornices are still very large. Recent cold temperatures have kept cornice failures to a minimum but they should always be treated with respect in the spring, especially when temperatures rise.

Terrain and Travel

  • A moist or wet snow surface, pinwheeling and natural avalanches are all indicators of a weakening snowpack.
  • Keep in mind that wet avalanches can be destructive due to their high density.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Minimize your exposure time below cornices.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Loose Wet

An icon showing Loose Wet

Likelihood

Very Likely

Expected Size

1 - 2

Freezing levels are highly variable at this time. Assess temperatures and wetness of surface snow closely as you transition from Treeline to Alpine elevations.

Aspects:

All aspects.

Elevations:

Treeline.

Wind Slabs

An icon showing Wind Slabs

Likelihood

Likely

Expected Size

1 - 2

Lower temperatures in the alpine may have allowed dryer snow to be blown into slabs. Use caution around wind loaded features. 

Aspects:

North, North East, East, South East, North West.

Elevations:

Alpine.

Cornices

An icon showing Cornices

Likelihood

Possible

Expected Size

1 - 2

Aspects:

North, North East, East, North West.

Elevations:

Alpine.

Valid until: May 1st, 2021 2:00PM

Forecast Trend

The latest forecast danger ratings, broken down to elevation. See how an elevation is trending.