Joint WGNE-WGSIP&S2S session presentations Pan-WCRP Modelling Groups Meeting and the 6th Session of the WCRP Modelling Advisory Council UK Met Office, Exeter, United Kingdom, 9‑13 October 2017 Steve Woolnough: WGNE MJO Task Force: Current Activities and Next Steps Hai Lin: Tropical-extratropical teleconnections on subseasonal time scale Ariane Frassoni: Evaluating aerosols impacts on Numerical Weather Prediction: Summary