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Forecast trajectories from day 0 to day 8 in the NAO-BLO space. Analysis for the previous 8 days (black line), ensemble mean trajectories (red line). Title shows initial date and time of ENS forecast; coloured markers show the ENS members at 24-hour intervals (see legend). EOF1: positive (right) and negative (left) phase of NAO; EOF2: blocking (top), "anti-blocking" (bottom)