March 2018 brought extremely cold conditions to the UK and substantial snowfall. What's really interesting is how tropospheric (T) and stratospheric (S) circulations interact. E.g. T affects S, S weakens in response (SSW), S then affects T later with different lag times. #datavis pic.twitter.com/YPoEPot70z

— James Warner (@MetmanJames) July 22, 2018