Abstract
The real-time forecasting of monsoon activity over India on extended range time scale (about 3 weeks) is analyzed for the monsoon season of 2012 during June to September (JJAS) by using the outputs from latest (CFSv2 [Climate Forecast System version 2]) and previous version (CFSv1 [Climate Forecast System version 1]) of NCEP coupled modeling system. The skill of monsoon rainfall forecast is found to be much better in CFSv2 than CFSv1. For the country as a whole the correlation coefficient (CC) between weekly observed and forecast rainfall departure was found to be statistically significant (99 % level) at least for 2 weeks (up to 18 days) and also having positive CC during week 3 (days 19–25) in CFSv2. The other skill scores like the mean absolute error (MAE) and the root mean square error (RMSE) also had better performance in CFSv2 compared to that of CFSv1. Over the four homogeneous regions of India the forecast skill is found to be better in CFSv2 with almost all four regions with CC significant at 95 % level up to 2 weeks, whereas the CFSv1 forecast had significant CC only over northwest India during week 1 (days 5–11) forecast. The improvement in CFSv2 was very prominent over central India and northwest India compared to other two regions. On the meteorological subdivision level (India is divided into 36 meteorological subdivisions) the percentage of correct category forecast was found to be much higher than the climatology normal forecast in CFSv2 as well as in CFSv1, with CFSv2 being 8–10 % higher in the category of correct to partially correct (one category out) forecast compared to that in CFSv1. Thus, it is concluded that the latest version of CFS coupled model has higher skill in predicting Indian monsoon rainfall on extended range time scale up to about 25 days.
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Acknowledgments
We sincerely acknowledge the NCEP for providing the real-time forecast products of their coupled models, which have been used in the present study. The first author is also thankful to the Director General, India Meteorological Department (IMD), for the valuable support in carrying out this work and to the DDGM (NWP) for providing computing facility. Thanks are also due to the National Climate Centre (NCC) and hydrology division of IMD for making available the rainfall data used in the present study.
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Pattanaik, D.R., Kumar, A. Comparison of intra-seasonal forecast of Indian summer monsoon between two versions of NCEP coupled models. Theor Appl Climatol 118, 331–345 (2014). https://doi.org/10.1007/s00704-013-1071-1
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DOI: https://doi.org/10.1007/s00704-013-1071-1