Persistent weak layers· Morning
- Above 2,400 m
Pronounced daytime changes lead to wet snow problem
Pronounced daytime changes lead to wet snow problem
During daytime changes, the danger quickly increases to level 3 "considerable". After softening of the often load-bearing melt-freeze crust, some large spontaneous wet snow avalanches are possible everywhere. Particularly at risk are steep areas in the extended northern sector between 2200 m and 2600 m, terrain that has not yet been discharged on high east, west and south-facing slopes, and generally those aspects where there is still a lot of snow. In wet snow, avalanches can tear through to the ground, run out untypically far and penetrate into the green. Triggering by winter sports and occasionally even remote triggering are possible.
In the morning, the avalanche risk is moderate above around 2400 metres in steep terrain from west to north to east. There are individual avalanche prone locations in the dry persistent weak layer, high alpine also in the southern sector. Take care in the transitions from little to lots of snow.
Overnight, a mostly stable melt-freeze crust forms, which softens during the day. Beneath this lies compact snow characterised by rain up to high altitudes, but softer layers are embedded, especially at higher altitudes, which enable fractures near the surface. On shady slopes from around 2400 metres, there are still weak layers of angular forms and deep rime in the old snowpack close to the ground. The snowpack becomes moist to wet up to high altitudes during daytime changes at the latest. Low and sunny slopes are covered in snow.
The night to Saturday will often be clear. In the northern Alps, high clouds will pass through at times. The frost line will be around 2500 metres. On Saturday, the sun will mostly shine in the morning, with a few spring clouds forming in the afternoon. Isolated showers cannot be ruled out. The wind will be mainly weak to moderately strong from different directions. The temperature at 2000 m will be 3 to 6 degrees, at 3000 m around -3 degrees.
The outgoing longwave radiation at night is limited and it cools down slightly during the day. The danger of wet avalanches remains.
Bulletin data: Avalanche Warning Service Salzburg (CC BY 4.0)