Zervreila

Fresh and drifted snow from the previous week is lying in many places on a faceted old snow surface or on surface hoar, especially on wind-protected shady slopes. Many avalanches triggered by human activity, including those from the end of this week, show that the connection to the old surface of the snowpack is still weak. South of a line from the Rhône to the Rhine, the entire snowpack is often faceted and loose. Here, avalanches may penetrate near-ground layers. On the northern flank of the Alps, in Valais and in northern Grisons, avalanches may still become dangerously large. Whumpfing sounds and remote triggering over larger distances have continued to be reported from Valais and northern Grisons in recent days. The probability of slab avalanches being triggered will decrease only slowly. The situation requires patience and caution.

With strong southerly winds at times, snowdrift accumulations that are prone to triggering have also formed in recent days.

The snow is wet at low and intermediate altitudes. Isolated gliding avalanches are possible on steep sunny slopes, especially on the northern flank of the Alps.

It was mostly cloudy in the north and partly sunny in central Valais and the east. It was very cloudy in the south with precipitation at times. The snowfall level was around 1300 m.

Fresh snow

From Friday afternoon to Saturday afternoon, above approximately 1500 m:

• Western Ticino, southern Simplon region: 10 to 25 cm
• Rest of the Main Alpine Ridge from the Great St. Bernard Pass to Val Bregaglia and south of there: 5 to 15 cm

Temperature

At midday at 2000 m, between +3 °C in the north and -2 °C in the south

Wind

From south-east to south

• Moderate to strong in the north, strong foehn wind at times in the regions exposed to the foehn wind in the north
• Sometimes moderate to strong south of the Main Alpine Ridge during the night to Saturday, weak to moderate during the day

In the north, it will be mostly sunny in the mountains with high cloud cover and a continuing foehn wind. It will be very cloudy in the south and a few centimetres of snow will fall above approximately 1300 m.

Fresh snow

Western part of the Main Alpine Ridge on the border with Italy, southern flank of the Alps: up to 5 cm

Temperature

At midday at 2000 m, around +3 °C in the north and -2 °C in the south

Wind

From south to southwest

• Moderate to strong in the north, strong foehn wind in the regions exposed to the foehn wind in the north
• Weak to moderate south of the Main Alpine Ridge

In the north, it will be mostly sunny in the mountains on both days with high cloud cover. The zero-degree level will be between 2000 and 2200 m. The southerly wind will be moderate. On Monday, it will still be strong at times in the regions exposed to the foehn wind in the north. The foehn wind will ease somewhat on Tuesday.

It will be very cloudy in the south on Monday. On the Main Alpine Ridge and south of it, 5 to 10 cm of snow is expected to fall above approximately 1500 m. On Tuesday, it will be increasingly sunny in the south. There will be a weak to moderate southerly wind.

The avalanche risk will not change significantly in the south. It will decrease in the north, but only slowly in the inneralpine regions. Weak layers in the old snowpack will remain prone to triggering.