GEOS forecasts suggest there is a possibility of a rare reversal of the 100 hPa 60°N zonal winds to easterlies, as the final stratospheric warming continues to evolve. U100-60 turning easterly is not common even during major mid-winter SSWs or the summer months. pic.twitter.com/sAF5YvhVbY

— Dr Simon Lee (@SimonLeeWx) April 7, 2022