After a record 83 day spell of negative NAO index, it became positive for just 1day before returning negative again over the last 2days. The GFS forecast predicts staying negative for the remainder of the month (although the ECMWF prefers it closer to neutral). @WorldClimateSvc pic.twitter.com/eb6VsHWjEb

— Simon Cardy (@weather_king) July 21, 2019