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Copernicus Emergency Management Service - CEMS > European Flood Awareness System > EFAS + JRC_Aug2023.png

The EFAS Seasonal outlook layer shows the maximum area-averaged probability of unusually high (> 90^th percentile, blue) or low (<10^th percentile, red) weekly river flow occurring during the 8-week forecast horizon for 74 major river basins over the EFAS domain, using colour-coded categories:

Dark blue: high (> 90%) probability of high flows
Medium blue: medium (75-90%) probability of high flows
Light blue: low probability (50-75%) of high flows
White: Near normal flow (below 50% for both low and high flow)
Light red: low probability (50-75%) of low flows
Medium red: 75-90% probability of low flows
Dark red: > 90% probability of low flows

Copernicus Emergency Management Service - CEMS > EFAS Sub-seasonal outlook > image2022-10-5_17-32-28.png

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Note that the area-averaged discharge is scale dependant and values will change with resolution change, between EFAS v4 and EFAS v5.

Copernicus Emergency Management Service - CEMS > EFAS Sub-seasonal outlook > image-2023-9-22_9-54-18.png