During the night to Wednesday and on Wednesday morning it will be cloudy on the southern flanks of the Alps and in Grisons. Some snow may fall above 1600 m. In other regions, Wednesday will be very sunny. On Thursday conditions will be very cloudy but dry on the southern flank of the Alps, with sunny conditions elsewhere. Winds will be mostly light on Wednesday, and occasionally moderate on Thursday, from the southwest.
Avalanche risk may continue to increase slightly during the night to Wednesday on the southern flank of the Alps, but elsewhere will barely change.
"}], "validTime": {"endTime": "2025-12-16T16:00:00Z", "startTime": "2025-12-16T07:00:00Z"}, "bulletinID": "c14e2a9e-3f05-42ee-82bf-d968b41223ca", "customData": {"CH": {"aggregation": [{"category": "dry", "problemTypes": ["wind_slab", "persistent_weak_layers"], "validTimePeriod": "all_day"}]}}, "nextUpdate": "2025-12-16T16:00:00Z", "unscheduled": false, "dangerRatings": [{"mainValue": "moderate", "customData": {"CH": {"subdivision": "neutral"}}, "validTimePeriod": "all_day"}], "weatherReview": {"comment": "Conditions were mostly sunny in the mountains, with high broken cloud gathering in the south-west and south from midday.
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At midday at 2000 m, between +4\u00b0C in the north and +1\u00b0C in the south
In the Alpine valleys in the north and generally at high altitudes, moderate, at times strong from southerly directions
Towards Tuesday morning, precipitation will set in on the Main Alpine Ridge and south of there. The snowfall level will be at around 1200 m. In other regions, it will be mostly cloudy but dry.
The following amounts will fall above 1600 m by Tuesday afternoon:
At midday at 2000 m, between +4\u00b0C in the north and -2\u00b0C in the south
In the Alpine valleys in the north and generally at high altitudes, at times strong from southerly directions
"}, "avalancheProblems": [{"aspects": ["N", "NE", "E", "W", "NW"], "comment": "Thus far only a little snow is lying. As a consequence of new snow and a sometimes strong southerly wind, wind slabs will form in the course of the day. These will be deposited on a weakly bonded old snowpack. Avalanches can be triggered in the old snow and reach medium size. The prevalence of avalanche prone locations and likelihood of triggering will increase in the afternoon. In the afternoon possibly danger level 3 (considerable) will be reached.The snow depths at intermediate and high altitudes are generally below average for the time of year. There is particularly little snow on the southern flank of the Alps. Only in parts of Lower Valais is snow depth roughly in line with the long-term average. On southern slopes and generally below 2400 m, the snowpack is mostly crusted.
Along the Main Alpine Ridge and south of there, fresh and drifted snow will be deposited at high altitudes on a thin but heavily faceted snowpack on Tuesday. Avalanches are particularly likely to be triggered in these regions.
North of the Main Alpine Ridge, there are pronounced weak layers in the snowpack, particularly on northern and eastern slopes above approximately 2400 m, but hardly any avalanches have been triggered there in recent days by human activity. At high altitudes the strong southerly wind may transport some of the old snowpack, resulting in snowdrift accumulations locally prone to triggering.
"}}}