Avalanche Bulletin - Little Yoho - Mon Jan 23, 2017

Issued: Sun Jan 22, 2017 18:34
Valid Until: Mon Jan 23, 2017 17:00

Caution is still advised TL and below where a weak basal snowpack remains a concern. Watch for windslabs in the alpine. Parks Canada will be conducting Avalanche Control on Mts Bosworth, Field, Stephen and Dennis Monday Jan 23. No skiing or climbing! [TH]

Public Avalanche Forecast
Danger Ratings: Monday alpine treeline below treeline
alpine: 2 - Moderate
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
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
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.
Forecast
Forecast Tuesday Wednesday
alpine View Alpine Danger Rating Trend 2 - Moderate 2 - Moderate
treeline View Treeline Danger Rating Trend 2 - Moderate 2 - Moderate
below treeline View Below Treeline Danger Rating Trend 2 - Moderate 2 - Moderate
Confidence: Moderate - Due to the number of field observations
High The forecast is based on high-quality information and the nature of the issue makes it possible to render a solid judgement. A 'high confidence' rating does not imply fact or complete certainty however, and such judgements still carry the risk of being wrong.
Moderate The information used to produce the forecast is credibly sourced and plausible, but it is not of adequate quality or sufficiently corroborated to warrant a higher level of confidence.
Low The credibility or plausibility of the information used to produce the forecast is questionable, or the information is too fragmented or poorly corroborated to make solid judgements, or there are significant concerns regarding problems with the sources.
Past 24 hour weather
Station Maximum (°C) Minimum (°C) Snowfall (cm) Snow Pack (cm) Wind speed Ridgetop wind direction
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.
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.
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.
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.
Extreme
  • Avoid all avalanche terrain.
  • Natural and human-triggered avalanches certain.
  • Large to very large avalanches in many areas.

Problem 1: Wind Slabs

Which Elevation?
Which Elevation? alpine
Which Slopes?
Which Slopes? southeast, east, northeast, north, west, northwest, south
Chance of Avalanches?
Chance of Avalanches? possible - likely
Expected Size?
Expected Size? small - large

Moderate to strong SW winds with the storm that ended Dec 19 created wind slabs in specific alpine locations.

Travel and Terrain Advice

  • Avoid steep lee and cross-loaded slopes

Problem 2: Storm Slabs

Which Elevation?
Which Elevation? treeline
Which Slopes?
Which Slopes? north, northwest, west, southwest, south, southeast, east, northeast
Chance of Avalanches?
Chance of Avalanches? possible - likely
Expected Size?
Expected Size? small - large

40cm of new snow has settled into slabs with the warm and humid weather. These continue to be reactive to tests around treeline where isolated SH has been found.

Travel and Terrain Advice

  • Use conservative route selection, choose moderate angled and supported terrain with low consequence.
  • Dig down to find and test weak layers before committing to a line.

Problem 3: Deep Persistent Slabs

Which Elevation?
Which Elevation? below treeline, treeline
Which Slopes?
Which Slopes? south, east, north, northwest, southwest, west, northeast, southeast
Chance of Avalanches?
Chance of Avalanches? unlikely - possible
Expected Size?
Expected Size? small - large

While this layer still exists in the alpine and should be considered in shallow areas it is mainly TL and below where this sugary snow in the lower snowpack continues to produce moderate shears. Take extra care BTL where this layer is shallow

Travel and Terrain Advice

  • Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.
  • Choose the deepest and strongest snowpack areas on your run.
Problem Glossary
Loose Dry
  • Are usually small, but may gain significant mass on long steep slopes.
  • Are typically limited to steep terrain (40+ degrees).
  • Stabilize soon after a storm, usually within a few days.
Loose dry avalanches are best managed by:
  • Avoiding terrain traps and large steep slopes until the surface has stabilized.
  • On large steep slopes, occasionally move across the fall line to avoid being caught by your own sluffs from above.
Loose Wet
  • Are more powerful than loose dry avalanches due to their higher density.
  • Are often limited to sunny slope aspects.
  • Are commonly confined to the warmest part of the day.
Loose wet avalanches are best managed by:
  • Avoiding start zones and avalanche paths when the snow becomes moist from daytime heating, from rain, or does not freeze overnight.
Wind Slabs
  • Vary in size from small to medium.
  • Occur on steeper lee and cross-loaded portions of slopes (typically 35+ degrees).
  • Are often limited to specific terrain features such as lee ridge-tops.
  • Can often be recognized by the appearance of the snow surface, changes in surface snow hardness, hollow, drum-like sounds and/or shooting cracks.
  • Winds that vary in strength and direction can produce complex and unexpected wind slab patterns.
  • Stabilize fairly soon, usually in a few days to a week.
Wind slabs are best managed by:
  • Recognizing and avoiding areas where wind slabs have formed, until they have stabilized.
Storm Slabs
  • Vary in size from small to very large.
  • May be soft slabs, fooling people into underestimating slab potential.
  • Tend to occur on moderately steep slopes (35+ degrees).
  • May occur in all terrain, but are larger and more frequent in the alpine.
  • Stabilize soon after a storm, usually within a few days.
Storm slabs are best managed by:
  • Conservative terrain choices during and after storms until the storm snow has stabilized.
Wet Slabs
  • Involve wet layers in the snowpack, typically including deeper layers.
  • Tend to be large.
  • Occur when water forms or penetrates below the surface of the snowpack.
Wet slabs are best managed by: 
  • Avoiding start zones and avalanche paths when the snow becomes wet from daytime heating, rain, or lack of an overnight freeze.
Persistent Slabs
  • Slide on buried persistent weak layers, which often form during clear periods and may involve deeper layers from multiple storms.
  • Vary in size from medium to very large and may cross terrain barriers to involve multiple slide paths.
  • May occur on very gentle terrain, even slopes of 20 degrees or less.
  • May be localized to specific elevations, aspects, or regions.
  • There are often no visible signs of persistent slab instability.
  • Lack of avalanche activity and lack of danger signs are NOTreliable indicators of stability.
  • Compression tests and Rutschblock tests may locate persistent weak layers.
  • Stabilize slowly, tending to persist for several weeks or longer.
  • Often have dormant periods, becoming active again when the weather changes.
  • Are prone to lingering pockets of instability that persist long after most areas have stabilized.
  • Tend to release above the trigger, making it difficult to escape.
  • Are often triggered remotely from a long distance away.
Persistent slabs are best managed by:
  • Very conservative terrain choices.
  • Allow extra time for persistent slabs to stabilize and use a very cautious approach to new terrain. Be especially cautious after storms or during warming periods.
Deep Persistent Slabs
  • Slide on deeply buried persistent weak layers, which often form during clear periods or rain-on-snow events early in the season.
  • Involve thick, hard slabs, sometimes the entire snowpack.
  • Tend to be very large, commonly cross terrain barriers to involve multiple slide paths.
  • Tend to occur on larger slopes of moderate steepness, typically 30-40 degrees.
  • May be localized to specific elevations, aspects, or regions.
  • There are often no visible signs of persistent deep slab instability.
  • Lack of avalanche activity and lack of danger signs are NOT reliable indicators of stability.
  • Stabilize slowly if at all, persisting for months and often the entire season.
  • Dormant persistent deep slab instabilities often become active again when the weather changes, especially after storms or with warm spring weather.
  • Tend to release above the trigger, making it difficult to escape.
  • Are often triggered remotely from a long distance away.

Deep persistent slabs are best managed by:

  • Very conservative terrain choices and a very cautious approach to new terrain.
  • Be especially cautious after storms or during warming periods.
Cornices
  • May trigger large slab avalanches on relatively stable slopes below.
  • Are often associated with recent wind loading and/or temperature changes.
  • Can be triggered from ridges, sometimes breaking surprisingly far back onto ridge tops.

Cornices are best managed by:

  • Approaching corniced ridges cautiously.
  • Avoid travelling on or near overhanging cornices and limit time spent exposed to slopes below cornices, especially soon after wind events and during periods of warming temperatures.
Forecast Details

Weather Forecast

A bit more cloud with a chance of trace amounts of precip for Monday before skies clear. Cold nights will be the price to pay for sunny afternoons with maybe some light winds reaching -5 C at valley bottom elevations. Watch for the sun to create moist snow on steep SW slopes given these conditions.

Snowpack Discussion

Wind slab from SW winds in the alpine where mid-pack facets produce variable moderate to very hard shears down 100cm in deeper snowpack. Isolated SH produces easy shears below storm snow at treeline. Mid-pack facets produce consistent moderate results at Treeline and Below. Solar effects on Steep SW at treeline and more modest angles S-W BTL.

Avalanche Activity Discussion

A few deep persistent slabs were observed today both appeared fresh but could be up to 3 days old and were sz 2. SW aspect from 2650m on Mt Ogden failed about 60 deep and 60 wide running about 450m. On the NW aspect of Wapta above Emerald lake 80 deep and 80 wide running several hundred meters. Otherwise evidence of previous loose wet activity BTL.

For More Details

Emergency: (403) 762-4506
Forecasters: (403) 762-1470

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