Avalanche Forecast

South Coast

Date issued

Mar 27, 2018 - 4:02 PM

Valid until

Mar 28, 2018 - 2:00 PM

Prepared by

mbender

It will take a few days for the recently formed storm and wind slabs to settle and bond.

Regular season
Tuesday - March 27, 2018
Alpine

3 - Considerable

Dangerous avalanche conditions. Careful snowpack evaluation,cautious route-finding and conservative decision-making essential.

Natural avalanches possible;human-triggered avalanches likely.

Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.

Treeline

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.

Below Treeline

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.

Wednesday - March 28, 2018
Alpine

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.

Treeline

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.

Below Treeline

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.

Thursday - March 29, 2018
Alpine

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.

Treeline

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.

Below Treeline

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.

Avalanche Problem 1: Storm Slabs

What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?

Significant snow and southwest winds have formed reactive storm slabs. These may be surprisingly deep and touchy in wind loaded areas near treeline and in the alpine.

Travel and Terrain Advice
  • Watch for whumpfing, shooting cracks and recent avalanches which indicate unstable storm slabs.
  • Be cautious as you transition into wind affected terrain.
  • Use ridges or ribs to avoid pockets of wind loaded snow.

Avalanche Summary

Ski cutting on the North Shore mountains on Monday morning produced widespread size 1 storm slab releases on all aspects within the recent storm snow. Reports from the northern part of the region around Squamish over the weekend indicate that a natural avalanche cycle occurred in steep and convex alpine terrain with last week's storm. Expect natural activity to start to subside as the new snow settles and bonds to the old snow below.

Snowpack Summary

The region has received 60-80cm of new snow since last Thursday. This new snow is generally bonded well to the old surface up to treeline elevations. Alpine areas around Squamish have likely received about 60-100 cm of storm snow and more wind. In these areas the storm snow is possibly sitting on a mixture of weak grains including a crust on solar aspects and potentially facets/surface hoar on polar aspects.

Below the storm snow the snowpack is generally well settled and strong.

Weather Forecast

WEDNESDAY: Mainly cloudy / Light to moderate west wind / Alpine temperature -1 / Freezing level 800 m.

THURSDAY: Periods of snow or rain, accumulation 10-15cm / Light to moderate southwest wind / Alpine temperature 2 / Freezing level 1400 m.

FRIDAY: Cloudy with sunny periods and isolated wet flurries or rain showers / Light west wind / Alpine temperature 2 / Freezing level 1300m

Danger Ratings Explained

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.

Natural 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.

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