Date issued

Mar 21, 2018 - 3:00 PM

Valid until

Mar 22, 2018 - 2:00 PM

Prepared by

mike.koppang

Crusts dominate the solar aspects but dry snow is still being found on the polar aspects.  Its not full on spring, stay on gaurd for thin weak areas and windslabs along ridgelines.  If the sun comes out, stability will det'r quickly!

Regular season
Thursday - March 22, 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.

Friday - March 23, 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.

Saturday - March 24, 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: Wind Slabs

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

Fresh windslabs in alpine areas along ridgelines and crossloaded features.  Watch for these at the entrances to runs.

Travel and Terrain Advice
  • Avoid freshly wind loaded features.
  • Use caution in lee areas. Recent wind loading have created wind slabs.

Avalanche Problem 2: Cornices

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

Overhead cornices loom along ridgelines.  As daytime temps warm up, these will become weak and have potential to collapse.

Travel and Terrain Advice
  • Pay attention to overhead hazards like cornices which could easily trigger deep slabs.
  • Cornices become weak with daytime heating, so travel early on exposed slopes.

Avalanche Summary

No new avalanches were observed or reported into the forecasting office over the past 24hrs.

Snowpack Summary

Convective flurries over the past 24hrs have given us an additional 5cm of snow that has fallen with very little wind.  Over the past few days 20-25cm of new snow has fallen that has had generally very light winds.  Isolated windslabs are being encountered in Alpine areas up to 40cm thick.  We are also still having concerns regarding thin weak areas where the basal areas may still be reactive.  Despite it being spring, keep a keen eye on snowpack depths as you travel.  Heat plays a large role at this time of year, solar aspects and quality of overnight freeze are critical things to be thinking of so pay attention to these concepts as you travel.  The best skiing is being found on polar aspects where there are no crusts. 

Weather Forecast

Convective flurries are forecast to continue over the next 24hr with accumulations around 10cm.  Freezing levels will be around 2100m with temperatures in the alpine around -5C.  If the sun does come out solar radiation will quickly decreased the stability on solar aspects so be sure to stay tuned into local weather patterns during the day.

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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