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. A 3 d episode of anomalously low ozoneconcentrations in the stratosphere over northern Europe occurred on 3–5 November 2018. A reduction of the total ozone column down to ∼  200–210 Dobson units was predicted by the global forecasts of the System forIntegrated modeLling of Atmospheric coMposition (SILAM) driven by theweather forecast of the Integrated Forecasting System (IFS) of the European Centrefor Medium-Range Weather Forecasts (ECMWF). The reduction down to 210–215 DU was subsequently observed by satellite instruments, such as the OzoneMonitoring Instrument (OMI) and Ozone Mapping Profile Suite (OMPS). Theepisode was caused by an intrusion of tropospheric air, which wasinitially uplifted by a storm in the northern Atlantic, south-east of Greenland.Subsequent transport towards the east and further uplift over the Scandinavianridge of this humid and low-ozone air brought it to ∼25  kmaltitude, causing ∼30  % reduction of the ozone layerthickness over northern Europe. The low-ozone air was further transportedeastwards and diluted over Siberia, so that the ozone concentrations wererestored a few days later. Comparison of the model predictions with OMI,OMPS, and MLS (Microwave Limb Sounder) satellites demonstrated the highaccuracy of the 5 d forecast of the IFS–SILAM system: the ozone anomalywas predicted within ∼10  DU accuracy and positioned within acouple of hundreds of kilometres. This episode showed the importance of thestratospheric composition dynamics and the possibility of its short-termforecasting, including such rare events.

Technical note: Intermittent reduction of the stratospheric ozone over northern Europe caused by a storm in the Atlantic Ocean