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The federal government warns of severe thunderstorms for Tuesday afternoon. There are about a dozen different natural hazards, from earthquakes to avalanches to wind. In general, there are hazard levels from 1 to 5. For example, meteorological warnings do not have all hazard levels defined for each phenomenon.
Hazard levels 1 to 5 are defined by the federal agencies that issue natural hazard warnings. Level 1 means “no or little risk”, level 5 means “very high risk”.
Warnings are only issued from level 2 onwards
In the case of meteorological phenomena, MeteoSwiss generally only warns from level 2. Danger level 1 has been introduced because there is often a potential danger in relatively inconspicuous weather, the weather service said at the request of the Keystone-SDA news agency.
The federal government and the cantons have agreed on the warning thresholds. In the case of meteorological warnings, not all hazard levels are defined for each event. For example, only level 3 and level 4 thunderstorm warnings exist.
MeteoSwiss explains that, despite state-of-the-art tools and methods, it is currently only possible to a limited extent to accurately predict violent thunderstorms for more than an hour and to warn for strength, time and location. Three levels of differentiation would therefore make little sense, it was said. Moreover, the chance of damage during a thunderstorm is usually limited locally.
In the heat, all day counts
Draft warnings are issued on levels 2, 3 and 4. They are based on the daily average temperature. This describes the heat stress during the day and does not depend on individual temperature peaks. In addition, the temperature during the night is also taken into account.
MeteoSwiss points out that nighttime temperatures are particularly relevant to human health. If it does not cool down sufficiently at night, the body can hardly recover and heat stress increases.
Ice warnings only up to 800 meters
Also special are the warning levels for slippery roads and ground frost. Levels 2 to 4 are available for slippery roads. However, no ice warnings are issued for altitudes above 800 meters above sea level or 1600 meters on the southern side of the Alps.
In black ice, authorities can issue level 3 and 4 warnings if the ice persists for several hours. For the other slipperiness warnings, warnings are only given at hazard level 2.
Ground frost warnings are only issued in the period from March 15 to October 31 and for low altitudes below 600 meters, especially where cold air lakes can form. The warnings are only issued at hazard level 2. (SDA)
Source:Blick
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