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Extreme Precipitation Seasonal Forecast Using a Transformer Neural Network

2021-07-14 17:02:15
Daniel Salles Civitarese, Daniela Szwarcman, Bianca Zadrozny, Campbell Watson
arXiv_AI
     
Abstract

An impact of climate change is the increase in frequency and intensity of extreme precipitation events. However, confidently predicting the likelihood of extreme precipitation at seasonal scales remains an outstanding challenge. Here, we present an approach to forecasting the quantiles of the maximum daily precipitation in each week up to six months ahead using the temporal fusion transformer (TFT) model. Through experiments in two regions, we compare TFT predictions with those of two baselines: climatology and a calibrated ECMWF SEAS5 ensemble forecast (S5). Our results show that, in terms of quantile risk at six month lead time, the TFT predictions significantly outperform those from S5 and show an overall small improvement compared to climatology. The TFT also responds positively to departures from normal that climatology cannot.

Abstract (translated)

URL

https://arxiv.org/abs/2107.06846

PDF

https://arxiv.org/pdf/2107.06846.pdf

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