IFS upgrade greatly improves forecasts in the stratosphere

Sleigh, Michael ; Browne, Philip ; Burrows, Chris ; Leutbecher, Martin ; Haiden, Thomas ; Richardson, David

Année de publication
<p align="justify">On 30 June 2020, ECMWF implemented a substantial upgrade of its Integrated Forecasting System (IFS). IFS Cycle 47r1 includes changes in the forecast model and in the data assimilation system. The upgrade has had a small positive impact on forecast skill in medium-range and extended-range forecasts in the troposphere and a large positive impact on analyses and forecasts in the stratosphere. The latter is mainly due to reduced large-scale biases.</p>

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