Abstract
Accurate and reliable air temperature forecasts are necessary for predicting and responding to thermal disasters such as heat strokes. Forecasts from Numerical Weather Prediction (NWP) models contain biases which require post-processing. Studies assessing the skill of probabilistic post-processing techniques (PPTs) on temperature forecasts in India are lacking. This study aims to evaluate probabilistic post-processing approaches such as Nonhomogeneous Gaussian Regression (NGR) and Bayesian Model Averaging (BMA) for improving daily temperature forecasts from two NWP models, namely, the European Centre for Medium Range Weather Forecasts (ECMWF) and the Global Ensemble Forecast System (GEFS), across the Indian subcontinent. Apart from that, the effect of probabilistic PPT on heatwave prediction skills across India is also evaluated. Results show that probabilistic PPT comprehensively outperform traditional approaches in forecasting temperatures across India at all lead times. In the Himalayan regions where the forecast skill of raw forecasts is low, the probabilistic techniques are not able to produce skillful forecasts even though they perform much better than traditional techniques. The NGR method is found to be the best performing PPT across the Indian region. Post-processing Tmax forecasts using the NGR approach was found to considerably improve the heatwave prediction skill across highly heatwave prone regions in India. The outcomes of this study will be helpful in setting up improved heatwave prediction and early warning systems in India.
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The authors thank the India Meteorological Department (IMD), European Centre for Medium-Range Weather Forecasts (ECMWF), and National Oceanic and Atmospheric Administration agency (NOAA) for providing data.
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Each author contributed to the conception and methodology of the study. Sakila Saminathan collected the data and analyzed it with the guidance of Dr. Subhasis Mitra. Sakila Saminathan wrote the first draft of the manuscript, and Dr. Subhasis Mitra commented on previous versions. All authors have read and approved the final manuscript.
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Saminathan, S., Mitra, S. Probabilistic post-processing of short to medium range temperature forecasts: Implications for heatwave prediction in India. Environ Monit Assess 196, 284 (2024). https://doi.org/10.1007/s10661-024-12418-3
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DOI: https://doi.org/10.1007/s10661-024-12418-3