Symbol |
Meaning |
Explanation |
 |
Intense Rain |
Precipitation event with prolonged rain of enormous amounts mostly over a larger area.
Exgtensive flooding, major rivers are on flood stage. In hilly terrain also landslides and mudflows occurr. |
 |
Intense rain heavy snow |
Precipitation event with prolonged strong rain and
possibility of flooding at low altitudes. At higher altitudes heavy snow will occurr causing snow breakages, snowdrifts,
avalanches.
|
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Heavy snow |
Precipitation event
with massive snow accumulation on the ground even in lowlands. Streets impassable due to snow, ice, drifting snow,
snow breaks.
|
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Icing |
Precipitation event with rain falling on frozen ground or rain falling at air temperatures below zero degrees.
Black ice, collpase of structures (e.g. power lines, trees) due to ice weight. Collapse of transport systems.,
power outages.
Precipitation amounts do not need to be significant.
|
 |
Tropical cyclones |
Tropical storms, tropical systems
and tropical cyclones (hurricanes, typhoons) of the subtropics when threatening populated islands or shorelines.
Damage expected due to hurricane force winds, torrential rain, flooding, landslides, swell, surf, storm surge
|
 |
Extratropical storms |
Exceptionally strong low pressure systems embeeded in the westerlies of both hemispheres when affecting populated areas
and damage is likely due to wind or storm surge. Also intense lokal wind systems (e.g. Föhn, Mistral, Bora)
|
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Thunderstorms, hail |
Convective and intense weather events associated
with strong rain, hail, hurricane force wind gusts. Usually not affecting large areas, mostly local occurrence
and not longlasting.
|
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Tornadoes |
Mostly in association with strong supercell thunderstorms. Brief in nature, but may cause
devastation along its path.
|
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Unusual high temperature |
Depending on altitude,
geographical location, and season unusual high temperatures. Heat waves.
|
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Unusual low temperatures |
Depending on altitude,
geographical location, and season unusual low temperatures. Cold spells. Harsh ice conditions
on rivers and sea. Frost.
|
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Flooding |
Large scale flooding
caused by long lasting rain over an large area or entire catchments of major rivers. Major rivers
are on flood stage. Sometimes in winter in conjunction with an extreme thaw period.
|
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Drought |
Extreme dehydration of soils if the rainy season fails or
onset comes too late. Even in areas with usually sufficient rain amounts, if there is a long period with no or only a little rain.
Damage to agriculture, shipping (low water), drinking water supply.
|
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Bush fire, forest fire |
Caused by heat, drought, lightning or
intentional fire raising. Bush or woods may burn for days, weeks or even months. Houses and other infrastructure
may be destroyed.
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