The colours show radar-estimated rainfall depth accumulated over the exact selected window. A value of 1 mm means one litre of water per square metre. For a selected polygon, volume is calculated from rainfall depth and physical Earth-surface area and is shown in m³ or litres. The coloured strip above the rainfall-history plot identifies the DWD product used for each interval: YW, RY, or RV. In Point mode, choose Place search or Coordinates; the coordinate option opens separate decimal Latitude and Longitude fields.
DWD supplies one rainfall amount for each five-minute interval. Times in the interface are Europe/Berlin time; source storage and calculations use UTC, including daylight-saving transitions. Custom durations may range from one minute to 50 days. If a duration starts inside a five-minute interval, only the overlapping fraction of that boundary interval is used. This linearly prorates its accumulated amount and does not invent a new observation.
The application quietly checks for newer DWD observations, analyses, and forecasts once a minute and whenever the tab becomes active. New availability extends the slider, but never moves the selected timestep or reloads the map and selected-location analysis.
The application combines Deutscher Wetterdienst (DWD) rainfall products by quality and latency. Settled YW is preferred, low-latency RY fills only the newer provisional observation tail, and RV supplies its lead-000 analysis plus forecasts through 120 minutes. A lower-priority product never replaces an available higher-priority interval; source gaps remain missing, and only matching 1200 × 1100 operational grids are joined. Historical windows still prefer quality-controlled RADKLIM YW when available. Downloaded files retain DWD provenance and a content fingerprint; maps and indexes are rebuildable caches. DWD source description.
Grid cells preserves the original 1 km radar cells. A point uses the cell containing it; an area uses the exact physical overlap with each cell. Smooth applies nodata-aware bilinear interpolation between cell centres to every five-minute observation before accumulation. It is an interpolation model, not additional measurement resolution. Map, point and area calculations all follow the selected mode.
Zero means observed no rain; missing means the radar value is unavailable. They are never treated as the same. Missing chart intervals are shaded and break the cumulative line. Map rainfall colors retain the chosen layer opacity even when a window is incomplete. “Spatial observations available” is the share of expected cell-time values present inside the radar footprint; a value just below 100% usually means a small number of flagged cells, while a temporal source gap is reported separately.
Coverage hides rainfall and shows the weighted share of the selected window for which each original radar cell contains a valid observation. Full coverage is blue; 99–<100% is teal; 90–<99% is gold; 50–<90% is orange; below 50% is red. The upper end is deliberately expanded so small gaps remain visible. Areas outside the radar footprint are transparent. Grid cells and Smooth are disabled in this diagnostic view because coverage always reports the unmodified source cells.
Click the colour bar to switch scales. Adaptive uses a duration-aware blue-to-violet scale that retains contrast for long accumulations; Smooth mode interpolates these colours. DWD classes converts the selected window total to its average rate and uses fixed, discrete DWD thresholds: marginal <0.2, very light 0.2–<0.5, light 0.5–<2, moderate 2–<10, heavy 10–<30, very heavy 30–150, and extreme >150 mm/h. Exactly zero remains transparent in either scale. Transparent areas may also be unavailable; use the status and coverage outline to distinguish incomplete data.
