Precipitation maps allow you to see the amount, distribution, type and probability of precipitation over a large area.
Precipitation and cloud cover
Cloud and precipitation maps show the expected precipitation, rain or snow, as well as the cloud cover during a given time period. The amount of precipitation is added from the previous (forecast) time interval (e.g. last 180 minutes). For instance, a 3h-accumulated precipitation for 11:00 shows the amount of precipitation accumulated between 08:00 and 11:00; for 14:00 the amount accumulated between 11:00 and 14:00, etc. With a 3h-step precipitation map, you should see 8 maps per day. The legend of colours helps you visualise quickly the amount of precipitation (in l/m²). Snow is marked by white hatching.
Aside from the cloud and precipitation maps, we also show maps with solely precipitation.
The probability of precipitation is shown by colours in %. Maps usually show the probability of a certain amount of precipitation, which is indicated on the top left above the map.
A precipitation probability map of 0.1 mm shows the probability to have 0.1 mm of precipitation, while another map shows the probability to have 1.0 mm of precipitation. The colours do not indicate the precipitation amount, only the probability.
Some maps with Probability of precipitation also display the wind direction through small arrows.
The radar images show the distribution of the actual precipitation. These images show most of the actual precipitation in areas well covered by radar, with colours showing the intensity steps (precipitation amount). Some phenomena, such as snowfall, drizzle, low rainfall in mountain valleys or multiple thunderstorms (which my hide each other) may not be visible on the map, because remote sensing observations are also subject to errors. Consult the local forecast for more precise details on the timing and amount of precipitation expected.