Grindelwald

Wind and new snow: At elevated altitudes a considerable avalanche danger will prevail.

During the night as a consequence of new snow and strong wind there will be a significant increase in the avalanche danger. The fresh snow and the sometimes large wind slabs are prone to triggering. During the night natural avalanches are to be expected. Even single winter sport participants can release avalanches, including large ones. Caution and restraint are required.

Snowpack On each of the recent days snow has fallen at elevated altitudes, so that a fairly large quantity of fresh snow is now lying in the high Alpine regions. Intense snowfall and strong wind in the north and northeast will give rise to large snow drift accumulations on Tuesday night. Underneath the fresh snow of recent days the old snowpack is thoroughly wet below approximately 2700 m on north facing slopes, and up to more than 3000 m in the other aspects. In particular in Grisons and partly in southern Valais, as well as in the other regions is isolated cases, weak layers still exist deep in the old snowpack. Avalanches released in the fresh snow and snow drift accumulations can penetrate these weak layers in some cases. Observed weather review Tuesday, 16.05.2023 There were bright spells in the south and in southern Upper Valais, but otherwise it was very cloudy. There was occasional precipitation, which fell as snow above approximately 2000 m. Fresh snow Between Monday afternoon and Tuesday afternoon the following amounts of snow fell above 2400 m:

• Northern Alpine ridge: 5 to 15 cm, but up to 30 cm from the Hasli valleys to the Titlis
• Elsewhere: less than 10 cm, but remaining dry in the south

Temperature In the middle of the day the zero degree level was between 2100 m in the north and 2500 m in the south Wind Mostly moderate, in the central and eastern regions of the Alps during the day at elevated altitudes sometimes strong, from the north Weather forecast through Wednesday, 17.05.2023 Tuesday night will be cloudy with intense precipitation in the north and partly in Grisons as well. The snowfall level will drop from 1900 to approximately 1200 m. During the day a little further precipitation will fall in the east and there will be bright spells in the west. Fresh snow Between Tuesday afternoon and Wednesday afternoon above 2400 m:

• Northern Alpine ridge from the Jungfrau region into Liechtenstein: 30 to 50 cm, more in some localities in the eastern part of the northern flank of the Alps
• Northern Alpine ridge from the Wildhorn into Lötschental, rest of central Grisons: 20 to 30 cm
• Elsewhere: mostly less than 20 cm, dry in the far south

Temperature In the middle of the day the zero degree level will be between 1800 m in the north and 2400 m in the south Wind There will be a northeasterly wind:

• During the night in the central and eastern parts of the main Alpine ridge, storm force
• Otherwise moderate to strong

Outlook through Friday, 19.05.2023 On each of the following days it will be cloudy with sometimes prolonged bright spells. There will be some isolated precipitation, mostly on Friday on the main Alpine ridge in Upper Valais, where approximately 10 to 20 cm could fall. The zero degree level will be approximately 2600 m. The wind will be light on Thursday and moderate on Friday, from the southeast. The danger of dry avalanches will decrease. On Friday it may increase slightly again on the main Alpine ridge in Upper Valais. Solar radiation is expected to trigger a large number of moist avalanches in the fresh snow that will fall on Wednesday. In the regions exposed to heavier precipitation, these may reach quite a large size. Thursday