July 2018 Atlantic Multi-decadal Oscillation (AMO) index using @ColoradoStateU definition is the lowest July value on record (since 1950), due to both very cold SSTs in the far North Atlantic along with very high sea level pressures across the North Atlantic. pic.twitter.com/jw2zGYLF15

— Philip Klotzbach (@philklotzbach) August 2, 2018