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Whistler Blackcomb, Whistler, BC Canada
Whistler Blackcomb, Whistler, BC Canada
Backcountry

Avalanche Advisory

Forecast provided by Avalanche Canada.

BACKCOUNTRY ADVISORY

Issued at: 2/24/2018 5:18:43 PM Valid to: 2/25/2018 10:00:00 PM

This three day avalanche hazard forecast is prepared for the Sea to Sky Region including surrounding areas of Whistler Blackcomb - Terrain easily accessible as a day tour from Whistler Blackcomb’s boundaries. This advisory refers to areas outside the ski are boundary.

AVALANCHE SUMMARY

Small loose and slab avalanches were observed at treeline and alpine elevations on Saturday, triggered by skiers, explosives, and naturally.

Expect natural and human-triggered avalanche activity to increase with the recent snowfall and strong winds.

SNOWPACK SUMMARY

Around 10 to 20 cm of storm snow fell on Friday and another 25 cm of snow could fall in parts of the region Saturday night, and light flurries are expected Sunday morning. These storms have had strong south to westerly winds associated with them. Expect touchy storm slabs on all aspects with thicker slabs found in lee features. All of this snow fell on previously wind-affected surfaces as well as a sun crust on solar aspects. The new snow may not bond well to these surfaces and could be reactive to both natural and human triggers.

Also make note of cornices at ridgeline. Variable winds in the past month have produced cornices on all aspects. They will become touchier as they grow in size, as temperatures rise, and as the sun packs a strong punch on clear days. Stand well back of them and avoid them from below!

WEATHER FORECAST

SATURDAY NIGHT: Cloudy with snowfall, accumulation 10 to 25 cm, strong westerly winds, alpine temperature -10 C, freezing level 500 m.

SUNDAY: Cloudy with intermittent snowfall, accumulation 5 cm, light to moderate westerly winds, alpine temperature -13 C, freezing level near 500 m.

MONDAY: Partly cloudy, light westerly winds, alpine temperature -12 C, freezing level 700 m.

TUESDAY: Cloudy with light snowfall, accumulation 5 cm, light to moderate westerly winds, alpine temperature -10 C, freezing level 800 m.

CONFIDENCE

Moderate - Timing, track, or intensity of incoming weather system is uncertain

TODAY'S DANGER SCALE

Alpine
Treeline
Below treeline
3 - Considerable
3 - Considerable
2 - Moderate

DANGER SCALE FORECAST

OVERVIEW Saturday Sunday Monday
Alpine Considerable Moderate Moderate
Treeline Considerable Moderate Moderate
Below treeline Moderate Moderate Low

1 - Low

  • Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
  • Natural and human-triggered avalanches unlikely.
  • Small avalanches in isolated areas or extreme terrain.

2 - Moderate

  • Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
  • Natural avalanches unlikely; human-triggered avalanches possible.
  • Small avalanches in specific areas; or large avalanches in isolated areas.

3 - Considerable

  • Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.
  • Naturale avalanches possible; human-triggered avalanches likely.
  • Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

4 - High

  • Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.
  • Natural avalanches likely; human-triggered avalanches very likely.
  • Large avalanches in many areas; or very large avalanches in specific areas.

5 - Extreme

  • Avoid all avalanche terrain.
  • Natural and human-triggered avalanches certain.
  • Large to very large avalanches in many areas.

Storm Slabs

Storm slabs have formed with new snow and strong winds. Expect deeper slabs in lee features and loose snow in sheltered areas. Stick to low-angled, sheltered terrain and give the snow time to stabilize.

What Elevations?
What Aspect?
Chances of Avalanches?
Expected Size?

Travel and Terrain Advice

  • Watch for signs of instability, such as avalanche activity, whumpfs, and shooting cracks.
  • Use caution above cliffs and terrain traps where small avalanches may have severe consequences.
  • Approach lee and cross-loaded slopes with caution.

FORECAST DISCLAIMER

USE AT YOUR OWN RISK:

The Whistler Blackcomb Avalanche Bulletin and other information and services provided by Avalanche Canada are intended for personal and recreational purposes only.

THIS INFORMATION IS PROVIDED 'AS IS' AND IN NO EVENT SHALL THE PROVIDERS BE LIABLE FOR ANY DAMAGES, INCLUDING, WITHOUT LIMITATION, DAMAGES RESULTING FROM DISCOMFORT, INJURY, OR DEATH, CLAIMS BY THIRD PARTIES OR FOR OTHER SIMILAR COSTS, OR ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, ARISING OUT OF THE USE OF THE INFORMATION.

The user acknowledges that it is impossible to accurately predict natural events such as avalanches in every instance, and uses the data in the bulletin with this always foremost in mind. The accuracy or reliability of the data is not guaranteed or warranted in any way and the Providers disclaim liability of any kind whatsoever, including, without limitation, liability for quality, performance, merchantability and fitness for a particular purpose arising out of the use, or inability to use the data.