Precipitation forecasts

The precipitation forecasts are given for six months lead time. The seasonal averages are split into two three month averages which correspond to the dynamical anomalies given elsewhere. The scale on each figure is percentage of normal, blue indicating above normal and red below normal.

The dashed contours shown on each map indicate where the mean of the ensemble forecast was different to the mean of the model climatology at the 90% significance level according to a students T-test. Although not the ideal test statistic it indicates where the model is more 'confident' that the forecast mean is different to climatology. There are no guarantees that a significant deviation will be realised.

Notes:

Comparison with last months forecast - click on link below
- Global Monthly Mean plots

Seasonal forecast
Monthly forecast