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An ensemble of data-driven weather prediction models for operational sub-seasonal forecasting

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arxiv 2403.15598 v1 pith:7YTEFOWN submitted 2024-03-22 physics.ao-ph cs.LG

classification physics.ao-phcs.LG
keywords ensembleweatherecmwfdata-drivenmodelspredictionforecastingforecasts
verification ladder T0 review T1 audit T2 compute T3 formal
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We present an operations-ready multi-model ensemble weather forecasting system which uses hybrid data-driven weather prediction models coupled with the European Centre for Medium-range Weather Forecasts (ECMWF) ocean model to predict global weather at 1-degree resolution for 4 weeks of lead time. For predictions of 2-meter temperature, our ensemble on average outperforms the raw ECMWF extended-range ensemble by 4-17%, depending on the lead time. However, after applying statistical bias corrections, the ECMWF ensemble is about 3% better at 4 weeks. For other surface parameters, our ensemble is also within a few percentage points of ECMWF's ensemble. We demonstrate that it is possible to achieve near-state-of-the-art subseasonal-to-seasonal forecasts using a multi-model ensembling approach with data-driven weather prediction models.

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  1. AIFS-CRPS: Ensemble forecasting using a model trained with a loss function based on the Continuous Ranked Probability Score

    physics.ao-ph 2024-12 conditional novelty 6.0 of 10

    A stochastic transformer weather model trained with the almost fair CRPS loss produces ensemble forecasts that beat ECMWF's physics-based IFS ensemble on most medium-range variables and match it at subseasonal timescales.

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