Comparing skill of historical rainfall data based monsoon rainfall prediction in India with NWP forecasts

• URL: http://arxiv.org/abs/2402.07851v2
• Date: Fri, 18 Jul 2025 20:33:17 GMT
• Title: Comparing skill of historical rainfall data based monsoon rainfall prediction in India with NWP forecasts
• Authors: Apoorva Narula, Aastha Jain, Jatin Batra, MN Rajeevan, Sandeep Juneja,
• Abstract summary: The Indian summer monsoon is a highly complex and critical weather system that directly affects over a billion people across the Indian subcontinent.<n> Accurate short-term forecasting remains a major scientific challenge due to the monsoon's intrinsic nonlinearity and its sensitivity to multi-scale drivers.<n>In this study, we address the problem of forecasting daily rainfall across India during the summer months, focusing on both one-day and three-day lead times.
• Score: 1.517355052203938
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The Indian summer monsoon is a highly complex and critical weather system that directly affects the livelihoods of over a billion people across the Indian subcontinent. Accurate short-term forecasting remains a major scientific challenge due to the monsoon's intrinsic nonlinearity and its sensitivity to multi-scale drivers, including local land-atmosphere interactions and large-scale ocean-atmosphere phenomena. In this study, we address the problem of forecasting daily rainfall across India during the summer months, focusing on both one-day and three-day lead times. We use Autoformers - deep learning transformer-based architectures designed for time series forecasting. These are trained on historical gridded precipitation data from the Indian Meteorological Department (1901--2023) at spatial resolutions of $0.25^\circ \times 0.25^\circ$, as well as $1^\circ \times 1^\circ$. The models also incorporate auxiliary meteorological variables from ECMWFs reanalysis datasets, namely, cloud cover, humidity, temperature, soil moisture, vorticity, and wind speed. Forecasts at $0.25^\circ \times 0.25^\circ$ are benchmarked against ECMWFs High-Resolution Ensemble System (HRES), widely regarded as the most accurate numerical weather predictor, and at $1^\circ \times 1^\circ $ with those from National Centre for Environmental Prediction (NCEP). We conduct both nationwide evaluations and localized analyses for major Indian cities. Our results indicate that transformer-based deep learning models consistently outperform both HRES and NCEP, as well as other climatological baselines. Specifically, compared to our model, forecasts from HRES and NCEP model have about 22\% and 43\% higher error, respectively, for a single day prediction, and over 27\% and 66\% higher error respectively, for a three day prediction.

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