Comparison of various verification measures among the RWCJ forecast, persistence method, and recurrence method for the M-threshold. (a) Absolute scores of the verification measures. Magenta, cyan, and yellow stand for the RWCJ forecast, persistence method, and recurrence method, respectively. (b) Difference in the scores between the RWCJ forecast and the persistence method as red and that between the RWCJ forecast and the recurrence method as blue. The black bars stand for the 95% confidence intervals of the scores. We note that as the FAR and POFD are negative orientation measures, the 1-FAR and 1-POFD are plotted, which are positive orientation values.