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ecCharts is a web-based presentation system developed to show a very wide range of ECMWF IFS model output worldwide in chart form, and in a very flexible way under the control of the user.  This allows ECMWF's medium-range forecasts to be viewed in far greater detail than was previously possible on the web, with panning and zooming being key functionalities that are not provided by the standard web charts.  ecCharts allows several forecast fields to be superimposed for ease of inter-comparison.  These charts may be animated throughout the forecast period as an aid to understanding the forecast structure of the atmosphere.  Ensemble output may be displayed in probabilistic form or as several derived fields (e.g.vorticity, divergence, CAPE, CAPE-shear, etc).  Also are simulated IR and WV images derived using the control member (CONTROL-10/HRESCTRL) of the medium range ensemble.   A probe tool is provided to allow display of values at a selected point at the chart time.  Results from the latest and previous forecast runs are also readily available.  Time sequences of variables at a selected point can also be displayed in graph form.  

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