The week was characterised by generally stable conditions with a few snowflakes brought in from the north and air temperatures dropping considerably.
Until April the 5th, the snow quality was generally good; during this period, mainly along East to West, going through South, the snow surface had typical spring conditions: hard in the morning and gradually softer with the daily warming. Since April the 6th, increasingly cold air temperatures have made the snow surface hard and less beautiful to ski.
SNOWPACK STABILITY AND AVALANCHE OBSERVATIONS
In the alpine, small sized, snow-drift accumulations formed, which could still be triggered by the loading of a single person. In the alpine, on steep Northern aspects, in very isolated cases, the superficial slabs stand on persistent weak layers and triggering medium sized avalanches along these layers is still possible. Along all the week, we did not recorded significant avalanche activity. Until April the 5th, the avalanche danger has followed the daily warming cycle, with danger level 1-Low in the morning and avalanche danger 2-Moderate during the warmer hours of the day; then remained 2-Moderate in alpine and 1-Low below the treeline.
In the alpine, the snow surface is wind affected; close to the ridges, the superficial snow is hard, elsewhere, small sized wind slabs, melt-freeze crusts and, only along leeward slopes, a superficial loose snow layer, alternate each other’s. Below the treeline, the few centimeters of new snow stand on load-bearing melt-freeze crusts. In the alpine, on Northern slopes, in isolated cases below the superficial slabs, persistent weak layers are recorded. Along Southern slopes, there is little or no snow.
The days were mostly sunny with air temperatures gradually dropping to below average for the period. Between April the 6th and April the 7th, there were light snowfalls coming from north, but the accumulations of fresh snow were limited to a few centimeters (1-5 cm).
2021-04-09 Snowprofile, Bernina station, North aspect