The weather forecasts do not use probability percentages but, rather, specific terms that apply to a defined range. The correspondence between the probability ranges and descriptive terms is as follows:
|
Probability |
Term |
|
0 to 20% |
Not excluded or no specific indication |
|
20 to 40% |
Possible |
|
40 to 70% |
Likely |
|
70 to 100% |
Very likely or no specific indication |
A probability applies to a defined region (e.g. eastern Switzerland), i.e. the likelihood of occurrence is representative of the entire region and does not necessarily indicate the probability for a particular location.
Probabilities are sometimes accompanied by a term describing the geographical distribution of the phenomenon. This type of information is generally used for parameters of a random nature, such as sunshine, cloud or precipitation.
|
Weather forecast |
Explanation |
|
Tomorrow, Tuesday: Partly sunny, with showers possible in the morning. Widespread showers in the afternoon and evening; localised thunderstorms likely. |
Between 20% and 40% likelihood of showers in the morning and more than 70% likelihood of showers in the afternoon and evening. 40% to 70% likelihood of thunderstorms. |
|
Tomorrow, Sunday often cloudy, with some showers possible in the afternoon. Bright intervals likely in the Swiss plateau. |
Between 20% and 40% likelihood of showers in the afternoon, affecting less than 40% of the forecast region. Between 40% and 70% likelihood of bright intervals in most of the Swiss plateau. |
|
Tomorrow, Friday very cloudy, with bright intervals not excluded in the Lake Constance area. |
Less than 20% likelihood of brief bright intervals. |
|
Very cloudy on Wednesday with extended spells of precipitation. Snowfall limit around 700 metres, with snow falling even in low-lying parts of the inner Alps. |
Over 70% likelihood of showers in most regions. Between 20% and 40% likelihood of snow falling even in low-lying parts of the inner Alps. |