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Weather Watch – Rain and meltwater lead to floods and landslides – Meteo

12 December 2023

Contents

Heavy rain will fall until Thursday and more snow will melt. This further exacerbates the flood situation.

Rain will fall repeatedly, at times intensely, until Thursday
The snowfall limit is still around 2000 m
A lot of rain and meltwater cause floods, floods and landslides

1/6

Legend:

Werthenstein/LU

Little Emme is rather big.

Urs Gutfleisch

Benches in the lake

Orange flood defenses

No parking due to flooding.

A small tarred path descends under the water

A foaming waterfall in a small stream.

Adverse history

Several factors are currently creating an unfavorable situation for flooding. It has rained a lot since mid-October. That’s why the rivers and streams were already carrying a lot or a lot of water at the weekend. In addition, the soil is saturated and drains are not clear in places due to snow or ice. The snow cover in the mountains is above average. Some of the snow has melted or continues to melt and is added to the runoff of the rain.

Precipitation amounts

On Tuesday it will rain widely and up to around 2000 m. There will be more heavy rain showers on Wednesday. After all, the snowfall limit drops again to 1500 to 1000 m. On Thursday, precipitation falls mainly on the northern slope of the Alps and the snowfall limit drops to 700 m by the evening. On the northern slope of the Alps there is a total of another 20 to 50 mm of precipitation until Thursday evening. The risk of landslides is likely to worsen accordingly. There have already been traffic disruptions, especially in the western parts of the country.

SRF rain warning

flood situation

The levels continue to rise due to the rain and meltwater. The The flood outlook from the Federal Office for the Environment (FOEN) therefore warns of level 2 of 5 floods on small and medium-sized rivers on the northern slopes of the Alps, in the Jura and the Mittelland. The following waters are warned at level 3: Aare below Lake Biel, Aare below Lake Thun, Canal de la Broye, Doubs, Hochrhein, Limmat, Lake Murten, Lake Neuchâtel, Sihl, Lake Thun, Zihlkanal. There is a high risk of flooding, level 4, on the Arve near Geneva and now also on Lake Biel.

What happens next from Friday?

The flood situation is not yet over. Even if the rainfall subsides by Friday morning, water levels will remain elevated for longer. The high pressure situation that will prevail over the weekend will then contribute to increasing relaxation.

Danger of avalanches

The combination of fresh snow at high altitudes and wet snow at lower altitudes leads to a high risk of avalanches throughout the Alpine region.

The conditions are dangerous for winter sports away from the secured pistes.

During a weather watch, a potentially dangerous weather situation is expected. In most cases, no SRF weather warnings have been issued at the time of publication. A weather watch is issued a few days before the expected weather event and is continually updated. The closer to the event, the more accurate the predictions usually are. If the event is already underway, the weather watch includes both an interim assessment and an outlook on what is still to come.

A weather watch is only issued if large parts of Switzerland are affected by a potentially dangerous weather situation and an SRF warning of level orange or red occurs. In the case of SRF yellow level warnings, the weather watch normally does not run.