Summer 2023 (particularly since July) across N America has been dominated by the Greenland High weather regime. In our recent study [https://t.co/ZFuT2UUdIB], we find that GH frequency has increased in recent decades (although recent years have also seen very low frequency too). pic.twitter.com/7hqEyFnsAo

— Dr Simon Lee (@SimonLeeWx) August 15, 2023