Bisistal

Snowpack

The sometimes storm force northerly wind will transport the new snow and, at higher altitudes, also the loosely bonded old snow. Some of the fresh wind slabs are prone to triggering. These are largest on the northern flank of the Alps and in Grisons, where the most transportable snow is present.

The old snowpack is quite favourable in the north, but in southern Valais and Grisons, it is faceted and is sometimes prone to triggering, especially in the Engadine and Val Müstair. In Ticino, the weak layers in the old snowpack are now so heavily covered that only isolated avalanches can be triggered in the old snowpack.

The old snowpack is water-saturated on southern slopes up to around 3000 m and on western and eastern slopes below approximately 2200 to 2400 m.

With a partly overcast night and as a consequence of solar radiation, the danger of wet and gliding avalanches increases from the late morning. As the day progresses, wet and gliding avalanches are increasingly possible.

Weather forecast to Monday

On Monday, some snow will fall in the east. The snowfall level will drop from 1400 m to around 1000 m. During the day, it will be sunny in the west and south and partly cloudy in the Engadine. The light snowfall will continue in the east.

Fresh snow

From Sunday evening to Monday afternoon:

• Central and eastern parts of the northern flank of the Alps, northern Grisons, Engadine north of the Inn: 5 to 15 cm, with up to 25 cm in northern Prättigau and the Silvretta.
• Elsewhere mostly dry.

Temperature

At midday at 2000 m, between -2 °C in the west, -6 °C in the east and 0 °C in the south.

Wind

• Strong to stormy during the night in the south and generally at high altitudes, strong from the north during the day.

Weather review for Sunday

During the night into Sunday, the light snowfall also ended in the east. The snowfall level was around 1500 m. During the day, the residual clouds gradually dissipated. It was mostly sunny at high altitudes and in the south.

Fresh snow

From Friday evening and into Saturday night:

• Northern flank of the Alps from the Bernese Oberland to the Alpstein region, northern Grisons: 10 to 20 cm, locally up to 30 cm.
• Elsewhere: up to 10 cm over a wide area.
• Dry on the southern flank of the Alps.

Temperature

At midday at 2000 m, between 0 °C in the north and +4 °C in the south.

Wind

• Temporarily moderate in the south and generally at higher altitudes, becoming increasingly strong again in the afternoon from the north.
• Elsewhere mostly light.

Outlook for Tuesday and Wednesday

During the night into Tuesday, a few flakes of snow will fall in the east above approximately 1000 m. Otherwise, it will be mostly sunny in the north on both days. In the south, it will be sunny on Tuesday and partly cloudy on Wednesday. The zero-degree level will rise gradually and on Tuesday will be at 2300 m in the north and 2000 m in the south. The wind will blow moderately from the east on Tuesday, with a strong Bise wind along the Prealps. On Wednesday, there will be a light to moderate southerly wind.

The risk of dry avalanches will decrease. The danger of wet and gliding avalanches will increase a little during the day.