Avalanche Forecast

South Coast

Date issued

Mar 31, 2018 - 3:00 PM

Valid until

Apr 1, 2018 - 2:00 PM

Prepared by

mgrist

Brief periods of sunshine could destabilize the surface snow on Sunday morning. Be alert for lingering wind slabs up in the alpine in the north of the region.

Regular season
Sunday - April 1, 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.

Monday - April 2, 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.

Tuesday - April 3, 2018
Alpine

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.

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: Wind Slabs

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

Wind slabs may linger at higher elevations, and could be destabilized by periods of direct sunshine over the long weekend.

Travel and Terrain Advice
  • Extra caution needed around cornices with current conditions.
  • Be cautious as you transition into wind affected terrain.
  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Avalanche Problem 2: Loose Wet

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

The sun really packs a punch this time of year - that's no April Fool's joke! Limit your exposure to sunny slopes if the sun comes out in full force.

Travel and Terrain Advice
  • Pay attention to hazards like cornices when traveling on or below ridges.
  • Watch for clues, like sluffing off cliffs and pinwheeling, that the snowpack is warming up.
  • Avoid exposure to sunny slopes.

Avalanche Summary

A few wet loose natural avalanches to size 1 were reported on sunny aspects on Saturday. We'd expect the same on Sunday with warming temperatures and direct sun.

Snowpack Summary

At tree line and below, we're into a spring cycle with a good re-freeze overnight (supportive crust) followed by daytime warming to +6 and wet surface snow. New snow amounts over the past three days (1-8cm) have been absorbed into the spring snowpack cycle.

Alpine areas around Squamish likely received about 60-100 cm of storm snow and more wind early last week. In these areas the more recent 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

There may be sunny breaks on Sunday morning before some convective flurries in the afternoon, with brief periods of intense precipitation. Temperatures are staying cool for this time of year.

SUNDAY: A mix of sun and cloud with convective flurries in the afternoon (3-5cm possible) / Light to moderate south west wind / Alpine temperature -6 / Freezing level decreasing to 500m in the afternoon

MONDAY: Mix of sun and cloud / Light to moderate west wind / Alpine temperature -5 / Freezing level 700m

TUESDAY: Cloudy with sunny periods / Light west wind / Alpine temperature -5 / Freezing level 800m.

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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