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Current rain hazards

Updated on: 30.07.2016, 22:25

Current rain hazards in Switzerland

  (2 Messages)   hide
  • Rain: Moderate danger, level 2

    Validity: 31.07.2016, 06:00 - 01.08.2016, 06:00
    Strong rainfall with 30-50 mm. All altitude levels.
    0:Rain:2:108,109,110,111,112,113,119,120,121,122,127,128,129,130,135,136,137,138,145,146,147,153,154,155,162,163,164,168,169,170,171,175,176,177:
    Adelboden-Kandersteg, Appenzell, Brienz-Interlaken, Einsiedeln-Wägital, Entlebuch, Erstfeld-Engelberg, Flüelen-Unterschächen, Frutigen-Kiental, Gersau-Engelbergertal, Glarus Nord-Mitte, Glarus Süd-Grosstal, Glarus Süd-Sernftal, Goldau-Ägeri, Grindelwald, Innertkirchen-Guttannen, Kerenzerberg-Seeztal, Langnau-Eggiwil, Lauterbrunnen-Wilderswil, Liechtenstein, Linthebene-Gaster, Luzern-Alpnach, Meiringen-Gadmertal, Muotathal, Niedersimmental, Obersimmental, Obertoggenburg, Rheintal, Saanen-Gsteig, Sarnen-Lungern, Schangnau-Sigriswil, St. Stephan-Lenk, Thun-Belp, Wahlern-Plaffeien, Werdenberg
  • Rain: Moderate danger, level 2

    Validity: 31.07.2016, 00:00 - 01.08.2016, 00:00
    Strong rainfall with 30-50 mm. All altitude levels.
    1:Rain:2:220,227,228,229,230,231,232,233,234,235,236,239:
    Aigle - Leysin, Basse-Gruyère, Bex - Villars, Conthey - Fully, Jogne - Haute-Gruyere, Monthey - Val d'Illiez, Pays-d'Enhaut, Préalpes vaudoises, Sion - Crans-Montana, Val d'Entremont - Val Ferret, Vallée du Trient, Vouvry

Kontextspalte

Danger level 1 (No or minor danger)
Danger level 2 (Moderate danger)
Danger level 3 (Considerable danger)
Danger level 4 (High danger)
Danger level 5 (Very high danger)
No danger level
Danger level 1 (No or minor danger)

Rain warnings are only issued for the danger levels 2 - 5.

Danger level 2 (Moderate danger)
  • Effects: Local swelling of streams or local flooding possible in areas where the ground is already saturated
  • Behaviour: Keep an eye on local weather developments, and act appropriately, according to the information you  receive on the conditions
  • Description of measurement and prognostic values:
    • Sustained rainfall north of the Alps and in the Alps: 30-50 mm/24 h
    • Sustained rainfall south of the Alps and in Simplon: 70-100 mm/24 h
    • Sustained rainfall in Verbano, Valle Maggia: 100-150 mm/24
Danger level 3 (Considerable danger)
  • Effects:
    • Swelling of streams, waterfalls and normally dry ditches, and flooding of exposed cave systems;
    • Disruption to road traffic on exposed stretches
  • Behaviour:
    • Keep an eye on local weather developments
    • Stay away from water (as well as dry river or stream beds) and from shores and river banks
    • Avoid steeply sloping terrain
    • Always follow the official recommendations
  • Description of measurement and prognostic values:
    • Sustained rainfall north of the Alps and in the Alps: 50-80 mm/ 24 h, 80-110 mm/48 h, 100-130 mm/72 h
    • Sustained rainfall south of the Alps and in Simplon: 100-130 mm/24 h, 130-160 mm/48 h, 160-200 mm/72 h
    • Sustained rainfall in Verbano, Valle Maggia: 150-200 mm/24 h, 200-250 mm/48 h, 250-300 mm/72 h
Danger level 4 (High danger)
  • Effects:
    • Potential for rivers to overflow onto floodplains and flood zones as well as around lake shores.
    • Heavily swollen streams, waterfalls and normally dry ditches, and flooding of cave systems;
    • Potential for localised landslides on steeply sloping terrain;
    • Failure of drainage and sewer systems;
    • Flooding of underpasses, underground garages and cellars/basements;
    • Disruption to road and rail traffic.
  • Behaviour:
    • Keep an eye on local weather developments
    • Stay away from water (as well as dry river or stream beds) and from shores and river banks
    • Avoid steeply sloping terrain
    • Always follow the official recommendations
  • Description of measurement and prognostic values:
    • Sustained rainfall north of the Alps and in the Alps: 80-120 mm/24h, 110-150 mm/48h, 130-170 mm 72h
    • Sustained rainfall south of the Alps and in Simplon: 130-160 mm/24 h, 160-200 mm/48 h, 200-240 mm/72 h
    • Sustained rainfall in Verbano, Valle Maggia: 200-250 mm/24 h, 250-300 mm/48 h, 300-350 mm/72 h
Danger level 5 (Very high danger)
  • Effects:
    • Flooding, even in areas which are not usually prone to flooding;
    • Extreme swelling of streams, waterfalls or normally dry ditches, even in areas which are normally at low risk;
    • Failure of drainage and sewer systems and flood protection barriers;
    • Flooding of underpasses, underground garages and cellars/basements;
    • Massive disruption to road and rail traffic;
    • High likelihood of landslides on sloping terrain and mudslides.
  • Behaviour:
    • Keep an eye on local weather developments
    • Stay away from water (as well as dry river or stream beds) and from shores and river banks
    • Avoid steeply sloping terrain
    • Always follow the official recommendations
  • Description of measurement and prognostic values:
    • Sustained rainfall north of the Alps and in the Alps: >120 mm/24 h, > 150 mm/48 h, >170 mm/72 h
    • Sustained rainfall south of the Alps and in Simplon: >160 mm/24 h, > 200 mm/48 h, >240 mm/72 h
    • Sustained rainfall in Verbano, Valle Maggia: >250 mm/24 h, > 300 mm/48 h, > 350 mm/72 h
No danger level

No evaluation