About Numerical Long-range Prediction
JMA operates a numerical prediction system composed of a global atmospheric circulation
model and a land process model for one-month, three-month and summer/winter season
forecasts. An ensemble prediction technique (which calculates atmospheric
evolution from many initial conditions around the most likely one) is employed to
increase accuracy, and is applied to probabilistic forecasts.
TCC provides ensemble prediction maps and verification charts of one-month, three-month and summer/winter season prediction through the TCC Web Site. These are available to all users. Registered users of NMHSs can access Grid Point Values (GPVs) of ensemble products in addition to charts.
One-month Prediction Maps --- upper left: precipitation amounts and their anomalies, lower left: surface temperature and anomalies