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Similarly, a negative wave height EFI would indicate relatively calm seas.

Time sequence of cumulative density functions and probability density functions

A convenient and powerful way to show the temporal evolution of successive ENS forecasts for a given day is to overlay the CDFs corresponding to each of those runs.  

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If the median of a new forecast lies outside the range of the previous forecast then a substantial "ensemble forecast jump" (for a given parameter) has occurred.  This would usually also be shown as a big change in EFI.  Such jumps are very uncommon, although probably they occur slightly more often than they should on purely probabilistic grounds.  They can be very disconcerting for forecasters.  Examples of meteorological scenarios when such behaviour is more likely are organised convective rainfall and extreme cyclonic windstorms.

(FUG Associated with Cy49r1)