In the north, conditions will continue to be very cloudy with persistent, heavy precipitation at times. The westerly wind will remain strong to storm-force, especially on the northern flank of the Alps and in the west. The amount of fresh snow is expected to be similar to that of the day before. The snowfall level will be between 1100 and 1300 m.
Avalanche danger will increase further generally, within level 4 in regions exposed to the most precipitation. An increased number of very large avalanches is expected in these regions, these being capable of descending right down into the valleys in the regular avalanche tracks and of endangering exposed transportation routes.
During the night to Friday, another 20 to 40 cm of snow will fall on the northern flank of the Alps, in Lower Valais and Pr\u00e4ttigau, but less in the rest of Valais and Grisons. The snowfall level will be between 1000 and 1200 m. Conditions will be dry on the southern flank of the Alps. During the day, conditions will be cloudy with brighter intervals on the northern flank of the Alps and mostly sunny in Valais and the south. The westerly wind will subside significantly.
Avalanche danger will increase again somewhat overnight to Friday and may reach dangerlevel 4 even on the eastern part of the northern flank of the Alps and in northern Grisons. Very large avalanches are possible on the northern flank of the Alps, these being capable of descending right down into the valleys and endangering exposed transportation routes. In Grisons, on the other hand, the risk relates primarily to alpine snow sports terrain.
", "valid_from": null, "valid_until": null, "tendency_type": null}], "tendency_lead": null, "weather_review": "Conditions were overcast on Tuesday, with light precipitation in almost all regions and with snowfall levels of between 1000 and 1500 m.
The following amounts fell up to Tuesday afternoon:
At midday at 2000 m, between -2\u00b0C in the north and -4\u00b0C in the south
Rising west to southwesterly, which, in the afternoon, was:
In the north, conditions will be very cloudy with precipitation. This will be heaviest in northern and the extreme west of Lower Valais and in the Vaud Alps. The snowfall level will rise in the west overnight to Wednesday to 2000 m and then drop to 1300 m. In Valais, it will be lower at times. In the south, conditions will be very cloudy overnight to Wednesday with some precipitation, while daytime conditions will be quite sunny.
Above 2200 m:
At midday at 2000 m, between -2 \u00b0C in the north and 0 \u00b0C in the south
There is appreciably less snow in all regions than is usual for the time of year, especially at low and intermediate altitudes. The large amounts of fresh snow expected in the west and north over the next few days will fall on a snowpack that is unfavourable in many areas, the surface of the snowpack being faceted and loose in many places. In addition, there are distinct weak layers that are prone to triggering in the middle and lower parts of the snowpack, especially on western, northern and eastern slopes, particularly south of a line from the Rhone to the Rhine. North of this, the snowpack structure is somewhat more favourable, but even in these regions there are weak layers deeper in the old snowpack. Against this background, a rapid and significant increase in avalanche danger is in prospect, especially in the west and north.
"}, "danger": {"key": "considerable", "number": "3", "ratings": [{"key": "considerable", "period": "all_day", "elevation": null, "subdivision": null}], "subdivision": null}, "source": "SLF", "traits": [{"prose": null, "title": "Dry avalanches", "band_id": null, "category": "dry", "problems": [{"extras": {"subdivision": "neutral", "core_zone_text": "Danger level \"considerable\" (3=) in all aspects above 2000m."}, "aspects": ["N", "NE", "E", "SE", "S", "SW", "W", "NW"], "elevation": {"lower": 2000, "upper": null, "treeline": false, "treeline_side": null}, "frequency": null, "time_period": "all_day", "comment_html": "Weak layers in the old snowpack necessitate caution. Even single snow sport participants can release avalanches. These can be triggered in deep layers and reach large size in isolated cases. Remotely triggered avalanches are possible. Whumpfing sounds and the formation of shooting cracks when stepping on the snowpack and fresh avalanches can indicate the danger.