The EFAS Seasonal outlook layer shows the maximum area-averaged probability of unusually high (> 90th percentile, blue) or low (<10th 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
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