Strong sunshine will increase avalanche danger during the day. Plan your route to minimize exposure to big sun-drenched slopes in the afternoon.
Summary
Confidence
Moderate - Due to the number of field observations
Weather Forecast
THURSDAY: Mainly sunny. The freezing level is around 1000-1200 m. Ridge winds are generally light: A mix of sun and cloud. The freezing level should jump to around 1400-1600 m and ridge winds are light to moderate from the E-SE. SATURDAY: Increasing cloud. The freezing level is around 1500 m and winds should be light.
Avalanche Summary
Wind-loaded N-E facing alpine slopes were reactive skier triggering with wind slabs up to size 1.5 in parts of the region on Tuesday. On Monday, a natural cornice release triggered a size 1.5 wind slab on a northwest aspect at 1750m which was 25cm thick. Skiers were triggering size 1 soft slabs on steep leeward slopes. In the far north of the region, a natural cornice release triggered a size 2.5 slab which released on the early March surface hoar layer.
Snowpack Summary
In sheltered areas at higher elevations, 20-30cm of low density snow can be found. Recent southerly winds have redistributed the surface snow in exposed terrain formed wind slabs and cornices in leeward terrain. South facing slopes could be capped a sun crust or moist snow depending on the time of day. A layer of surface hoar from early March can be found down 60-80cm but only seems to be a problem for the northern half of the region. Professional operators are still tracking two deep weak layers from early-January and early-February which can be found down about 1m or more. These layers have been dormant for a couple weeks but could wake up with heavy storm loading, substantial warming, or a heavy trigger like a cornice fall. In the far north of the region, there is an isolated weakness at the base of the snowpack that has been responsible for some very large and destructive avalanches.
pmarshall,
Avalanche Canada
