The Seasonal outlook river network overview layer shows the maximum area-averaged probability of unusually high (> 80^th percentile, blue) or low (<20^th percentile, orange) weekly river flow occurring during the four 4-month forecast horizon over the model river network for upstream areas greater than 1000kms, using colour-coded categories:

• Dark blue: > 90% probability of high flows
• Medium blue: 75-90% probability of high flows
• Light blue: 50-75% probability of high flows
• Light orange: 50-75% probability of low flows
• Medium blue: 75-90% probability of low flows
• Dark blue: > 90% probability of low flows

In the river network layer, additional colours also represent areas where the forecast does not exceed 50 % probability of exceeding either the high or low flow threshold (light grey) and where the river pixel lies in a climatologically arid area such that the forecast probability cannot be defined (dark grey).