Some of the recent studies such as the APCC-supported CliPAS research(Wang et al., 2008) results suggest reshaping the strategy for predicting summer rainfall, and point to the necessity to establish one-tier MME forecast system for longer-lead prediction, particularly in monsoon regions. In general, it is expected that the APCC operational MME prediction, which currently mainly consists of two-tier predictions can be improved through inclusion of more individual coupled model predictions, or migrate to a fully coupled MME prediction system. Hence, APCC has recently initiated 6-month lead coupled MME climate prediction activity to provide a longer lead forecast.

Since February 2008, APCC has initiated experimental 6-month 1-tier MME prediction. The forecast data from 6 coupled models are being used in 1-tier MME prediction. The MME forecasts are generated 4-times a year, with the initial conditions of the first month of February, May, August and November. So far, forecast and hindcast for 2008MAMJJA, 2008JJASON, 2008SONDJF, 2008DJFMAM and 2009MAMJJA has been completed with 3 research models and 2 operational models, and more recently APCC's experimental coupled model. Our 1-tier MME indicated a scope for further potential improvement. The most important challenge is the limited number of the available coupled forecast as well as the limited number of ensembles. Therefore, we would like to invite other coupled prediction groups all over to contribute to this effort.

There are some requirements.

1) Report on regular hindcast/forecast verification skills and diagnostics

2) MME digital data

3) Redistribution of model data to the other model providers and non-commercial users (subject to approval of the respective model providers)