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Avalanche Forecast

Archived

Apr 14th, 2013–Apr 15th, 2013

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

South Rockies.

Due to a lack of information sources at this time of year, this forecast is based primarily on weather data. If you have been traveling in the backcountry recently, send us your observations. Email us at [email protected]

Confidence

Poor - Due to limited field observations for the entire period

Weather Forecast

Monday: An upper trough of low pressure brings unsettled weather. Isolated snow showers and broken skies are expected. Winds light to moderate from the northwest and freezing levels 1000m.Tuesday and Wednesday: An Upper ridge of high pressure builds bringing generally dry conditions and clearer skies. Freezing level 600-1000m on Tuesday and 1500m on Wednesday. Winds light to moderate northwesterly.

Avalanche Summary

Recent reports from Saturday indicate loose snow avalanches to size 1.5 running out of steep rocky terrain and 20-30cm thick slab avalanches running to size 2 in crossloaded features. These avalanches are running at the interface between the recent storm snow and the old snow.

Snowpack Summary

20-30cm of new snow sits on a variety of surfaces. Overnight freezing has consolidated previously loose wet snow at treeline and below. Recent moderate winds may have developed windslabs at upper elevations. Surface crusts are expected to break down during the day and then re-freeze overnight.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.