The package contains more than 80 metrics and diagrams and includes deterministic scores such as mean absolute error, threshold-based metrics such as the equitable threat score, probabilistic scores such as the Brier score, and composite diagrams such as the Taylor diagram. Scores can be graphed as a function of date and forecast lead time, but can also be plotted on a map to show spatial variability of the scores.
The program requires the user to put observations and forecasts along with their initialization time, lead time, and geographical coordinates into a simple text format. Forecasts can be in deterministic, ensemble, or probabilistic form.
The tool allows quick on-the-fly investigation of forecast performance, but can also generate figures automatically in an operational setting. A range of options exists to control image dimensions, colors, and font sizes.