Avalanche Bulletin - Little Yoho - Sun Dec 17, 2017

Issued: Sat Dec 16, 2017 17:00
Valid Until: Sun Dec 17, 2017 17:00

We are still in a dormant period throughout the region. Watch local snowfall amounts for small wind slab formation in the alpine if we get more snow than expected. Alpine ski quality has improved over the last 48 hours. [SH]

Public Avalanche Forecast
Danger Ratings: Sunday alpine treeline below treeline
alpine: 1 - Low
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
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
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.
Forecast
Forecast Monday Tuesday
alpine View Alpine Danger Rating Trend 2 - Moderate 2 - Moderate
treeline View Treeline Danger Rating Trend 1 - Low 1 - Low
below treeline View Below Treeline Danger Rating Trend 1 - Low 1 - Low
Confidence: Moderate
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.
Forecast Details

Weather Forecast

Another 5-10cm by Sunday night and possibly 5cm more on Monday with mod-strong WNW alpine winds. Temperatures should remain seasonal.

Snowpack Discussion

A few cm of new snow and thin wind skins now cover the mix of sun crust, facets, wind slab and surface hoar depending on the aspect and elevation. The main features in the snowpack are the Nov 27th and Nov 23rd crusts down 10-40cm, and the Halloween crust/facet layer sitting 30-50 cm above the ground, which have been dormant recently.

Avalanche Activity Discussion

No new avalanches observed or reported in the past several days has lead to no avalanche problems being listed in the bulletin.

For More Details

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

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