The decelaration of stratospheric winds is slowly propagating downwards. ECMWF is now forecasting an easterly zonal mean zonal wind at 50 hPa (~20 km altitude).

Note that in the #SuddenStratosphericWarming of 2018 the wind at 50 hPa never reversed. pic.twitter.com/73iLV8rzsO

— Mika Rantanen (@mikarantane) January 14, 2019