Avalanche Forecast
Issued: Mar 25th, 2014 9:42AM
The alpine rating is Storm Slabs, Cornices and Deep Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Fair - Freezing levels are uncertain on Wednesday
Weather Forecast
Wednesday: Periods of snow possible accumulations to 5 cm. Freezing level expected 1200-1400m. Ridge winds light to moderate from the SW. Thursday: Cloudy with flurries and possible sunny breaks. Freezing level expected at 1200 m. Ridge winds light gusting to moderate from the west and southwest. Friday: Cloudy with sunny periods and isolated flurries. Light southwest ridge winds. Freezing level rising to 1900m.
Avalanche Summary
Observations from the last 4 days are limited to small loose snow avalanches on steep unsupported features.On Friday a few loose natural avalanches to size 2 were observed in steep alpine terrain. Explosive control work in the region produced size 2 avalanches that were only 10 - 30 cm in depth.
Snowpack Summary
See this great video from our South Rockies field team that does an awesome job of summarizing the current state of the snowpack.The region has picked up 60 - 100cm of storm snow that fell in the last week. Winds have been out of the SW through NW which has created fresh wind slabs in alpine and treeline lee terrain. Around 70 cm of settling storm snow rests on a graupel layer that can be found in much of the region. This makes for around 90 cm on top of the mid march crust at this point. This crust exists on all aspects below 2000m and on solar aspects in the high alpine. North of Sparwood and in the Crowsnest Pass area, the buried crust seems more specific to previously sun-exposed slopes. The deep facet/crust persistent weakness buried at the beginning of February (now down up to 150cm) seems unlikely to trigger in areas where the hard, supportive exists. No matter where you are in the region, this weakness should stay on your radar as any activity at this interface would be large and destructive. Possible triggers include a large cornice fall, a large input in a thin snowpack area or solar warming.Cornices have also become large and unstable.
Problems
Storm Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Cornices
Aspects: North, North East, East, South East.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Mar 26th, 2014 2:00PM