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The river network summary map also contains the reporting points, which are labelled in Figure 2b. These are river locations, where detailed information is provided about the evolution of the forecast signal over the forecast horizon. These reporting points are either fixed points, which are also used in the medium-range flood products and the basin-representative points, which are selected locations on a one point per basin basis. Further details about the basins and the representative points are available here: Placeholder CEMS-flood sub-seasonal and seasonal basins and representative stations.
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Figure 2. Example snapshots of the river network forecast maps with the reporting points, lead time navigation indicated and categories and colours explained.
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The basin Rank-mean and Rank-std values are determined using all the large enough river pixels in the basin. Currently, only pixels above 50km2 are used in EFAS and pixels above 250 km2 are used in GloFAS in the averaging. The basin Rank-mean/Rank-std values are calculated as an arithmetic average of the Rank-mean and Rank-std values of the individual river pixels, weighted by the square of the upstream area, as described below:
Figure 6. Example snapshot of the sub-seasonal and seasonal river network summary basin summary maps with the animation panel and river pixel lead time navigation indicated and the categories and basin colours explained.
Lead time navigation
The forecasts can be advanced (or even animated if needed) with the lead time controllercontrol panel, both on the river network and the basin summary map layers (see Figure 1a 2a and Figure 4 6 bottom left corner) and the . The users can check the individual forecast signal for each lead time, which currently is 5 or 6 weeks for the sub-seasonal (depending on which day of the week the forecast run date is) and always 7 months for the seasonal.