Avalanche Forecast

Issued: May 1st, 2017 4:00PM

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

Avalanche Canada ian jackson, Avalanche Canada

This is the last scheduled bulletin for Little Yoho region. Refer to the Banff, Yoho & Kootenay bulletin for current conditions.

Summary

Weather Forecast

Spring weather. Some resources for weather forecasts are Avalanche Canada, and Spot Wx.

Snowpack Summary

A spring snowpack exists with multiple melt freeze crusts on solar aspects. Dry snow may be found only on the highest north aspects. A basal weakness remains at the bottom of the snow pack. It is currently only reactive to large triggers like cornices but may wake up with solar warming.

Avalanche Summary

Check the Banff, Yoho & Kootenay National Parks bulletin for recent avalanche observations.

Confidence

Problems

Loose Wet

An icon showing Loose Wet

Loose wet avalanches can be expected on solar aspects in the afternoon when the day warms up.

  • Pay attention to sluffing off cliffs and steep solar terrain, signs of a warming snowpack.
  • If triggered the loose wet sluffs may step down to deeper layers resulting in large avalanches.

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

Elevations: All elevations.

Likelihood

Possible

Expected Size

1 - 2

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

The weak basal facets can produce large avalanches with large triggers or heat. Remember that the snowpack is generally strongest in the morning when it is cool.

  • Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

2 - 4

Cornices

An icon showing Cornices

Cornices are large and will fall off at some point this spring. These large triggers have been enough to trigger the deep persistent layer. Be especially careful of these on warm afternoons.

  • Pay attention to overhead hazards like cornices which could trigger the deep persistent slab.

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 3

Valid until: May 2nd, 2017 4:00PM