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Two web layers are available for both the CEMS-Flood sub-seasonal and seasonal systems on both the EFAS and GloFAS websites. These are the the river network map, which also includes the reporting points and the related popup windows delivering extra information about the forecast evolution, and the basin summary map (see the last column on the right side of Figure 1).
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The river network map highlights the combined forecast anomaly/uncertainty signal on the rivers, including all river pixels above 250 km2 in EFAS and 1000 km2 in GloFAS. The forecast signal (or overall expected anomaly for a given lead time) is indicated given by colouring on the river pixel. Five Five anomaly categories ('Near normal' combining the three middle categories of the 7-category version) are shown with different colours, with the uncertainty level supplementing it by one of the three predefined intensitiesprovided as different colour intensity.
From the river network summary map, the reporting point popup products can be accessed by clicking on the point markers on the river network layer (See more on the reporting points at CEMS-Flood diagnostic and web reporting points and Placeholder CEMS-flood sub-seasonal and seasonal basins and representative stations). The pop-up window product contains metadata information about the stations, a hydrograph with the evolution of the climatological, antecedent and latest forecast conditions, and the probability evolution table which shows discharge probability for each of the 7 anomaly categories from the most recent forecast runs, and highlights with colour the overall expected anomaly category through the colour of the cell. Note the probability table is divided in seven 7 anomaly categories with the larger 'Near normal' category shown on the river network and basin summary maps and the hydrograph extended into 3 categories3 categories.
Basin summary map
The basin summary map is a geographical summary of the river network map, after averaging the signal in the predefined basins (see Placeholder CEMS-flood sub-seasonal and seasonal basins and representative stations) and synthesising the more complex and geographically variable information presented on the river pixels in the river network layer.
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The river network and basin summary forecasts are provided for each lead time individually. The functionality is accessible through the control panel Users can navigate through lead-times by using a control panel of the bottom left of the map viewer when selecting the layer, which allows the option to navigate the maps, with the users able to go backward and forward within the forecast horizon and check each forecast lead time of calendar weeks in the sub-seasonal and calendar months in the seasonalproviding a menu for the available forecast dates. For each forecast date, 6 maps (which for some days of the week forecast run dates decreases to 5) are available for the sub-seasonal products (from week-1 to week-6) and 7 maps are available for the seasonal products (from month-1 to month-7).
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