Avalanche Forecast

South Coast

Date issued

Mar 12, 2018 - 3:42 PM

Valid until

Mar 13, 2018 - 2:00 PM

Prepared by

mbender

Another day of warm temperature and partial sun on Tuesday. Expect a shift Tuesday afternoon with a drop in temperature and some precipitation.

Regular season
Monday - March 12, 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 - March 13, 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.

Wednesday - March 14, 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: Loose Wet

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

Sunshine and warm temperatures will weaken the surface snow surface.

Travel and Terrain Advice
  • Use caution above cliffs and terrain traps where small avalanches may have severe consequences.
  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Avalanche Problem 2: Cornices

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

Warm temperatures and sunshine will make already large and overhanging cornices ripe for triggering.

Travel and Terrain Advice
  • Give cornices a wide berth when traveling on ridges.
  • Cornices become weak with daytime heating, so travel early on exposed slopes.

Avalanche Summary

No recent notable avalanches have been reported.

Snowpack Summary

Surface snow in the past few days has undoubtedly become moist or wet on all aspects to mountain top with sunny skies and a high freezing level. Depending on the time of day, you may find the surface to be moist or be a frozen crust. The overall snowpack is well settled. Cornices formed or have grown more overhanging with the snowfall at the end of last week. They become touchier as they grow in size, as the temperature rises, and/or as they are impacted by the strong late-winter sun.

Weather Forecast

MONDAY: Mix of sun and cloud in the am then rain showers or flurries into the night/ Light to moderate southeast wind / Alpine temperature 11 / Freezing level 2400m

TUESDAY: Cloudy with rain showers / Moderate southeast wind / Alpine temperature 13 / Freezing level 2500m

WEDNESDAY: Mainly cloudy with isolated flurries / Light west wind / Alpine temperature 1 / Freezing level 1100m

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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