Date issued

Nov 16, 2017 - 3:00 PM

Valid until

Nov 17, 2017 - 2:00 PM

Prepared by

mike.koppang

15-25cm recent new snow. If the forecasted strong SW winds arrive overnight we can expect windslabs to quickly build and the danger push into Considerable in Alpine areas.  Keep an eve on overhead terrain and local weather.

Regular season
Friday - November 17, 2017
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
Saturday - November 18, 2017
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
Sunday - November 19, 2017
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

Avalanche Problem 1: Wind Slabs

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

If the forecasted winds arrive, we can expect windslabs to quickly build in open alpine areas. 

Travel and Terrain Advice
  • Avoid lee and cross-loaded terrain near ridge crests.
  • Be careful with wind loaded pockets while approaching and climbing ice routes.
  • Avoid freshly wind loaded features.

Avalanche Summary

A few natural avalanches were observed on N aspects in Alpine terrain.  These slides were sz 1.5-2 and were likely fresh windslabs that had been newly building along ridgelines in Alpine areas.  They occurred on N aspects but ran far down into treeline areas. A few loose dry slides were also observed

Snowpack Summary

15-25cm of new storm snow over the past 36hrs that fell with only light winds (15cm at Highwood and 25cm at Smith Dorried).  Throughout the day winds began to increase out of the SW and windslabs were observed building in Alpine areas. Easy sheers within the HST and a Moderate RP was being observed below the 1031 crust. Still lots of variability of snowpack depths.

Weather Forecast

The snow will taper off overnight giving us a mix of sun and cloud on Friday.  Winds are forecast to increase overnight into the moderate to strong range so we can expect windslabs to rapidly build if the forecaster winds arrive. Temperatures will be around -8C.

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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