Date issued

Mar 15, 2018 - 3:00 PM

Valid until

Mar 16, 2018 - 2:00 PM

Prepared by

mike.koppang

Warm temps, recent new snow (up to 30cm) and light winds are increasing the avalanche danger.  This new snow will take a few days to stabilize.

Regular season
Friday - March 16, 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

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.

Saturday - March 17, 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

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.

Sunday - March 18, 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.

Avalanche Problem 1: Storm Slabs

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

New storm slabs building in alpine and treeline areas as the recent HST settles.  Use caution in steeper areas.

Travel and Terrain Advice
  • Expect heavy trailbreaking until the storm snow settles out.

Avalanche Problem 2: Wind Slabs

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

New windslabs will build overnight with the recent storm snow and winds. We are forecasting this problem for the alpine only.

Travel and Terrain Advice
  • Use caution in lee areas. New snowfall mixed with wind loading is creating Wind Slabs.

Avalanche Problem 3: Loose Wet

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

If the sun does come out, expect loose wet avalanches to occur quickly.  Thin cloudy may also cause greenhouse effect warming the snow up quickly even with no direct sunlight.

Travel and Terrain Advice
  • Use extra caution on slopes if the snow is moist or wet.
  • Minimize exposure to steep, sun exposed slopes when the solar radiation is strong.

Avalanche Summary

No new avalanches were observed on Thursday but visibilty was extremely limited.

Snowpack Summary

Well the forecasted storm did arrive giving us close to 25cm at treeline and above.  The storm came in warm and as a result the snow has been quick to settle and so far appears to be bonding poorly to the underlying snow surface.  Storm slabs should be expected while the snow settles that will be reactive to human traffic in steeper areas.  Winds are forecast to be calm, but we expect there to be some isolated windslabs in alpine areas along ridgelines.  This new snow will freshen up the skiing but the key layer to watch will be the bond with the underlying snow surface.  Move into bigger terrain slowly and evaluate this layer before committing to terrain.

Weather Forecast

Another 5-8cm of snow is forecast to fall overnight adding to the 20-25cm that we received throughout the day on Thursday.  Warm temps will promote fast settlement of the new snow.  Skies are forecast to be overcast but we may see the sun poke out from time to time.  Winds are likely to be moderate out of the NW tonight before becomming more calm on Friday.

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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