Troposphere giving the stratosphere a poke while it awakens from its summer slumber... replicate this in 2 months and things could get interesting* [see also https://t.co/o1BJefdH9O]

*of course, it's always interesting regardless ;) https://t.co/NfHIsQHHrf pic.twitter.com/2li8tcmTqZ

— Dr Simon Lee (@SimonLeeWx) September 21, 2020