This July's Atlantic Meridional Mode (AMM) index value was the 2nd lowest July value on record (since 1948), trailing only 1972. A negative AMM tends to be associated with colder tropical N Atlantic SSTs, higher sea level pressures and less active Atlantic #hurricane seasons. pic.twitter.com/MmsxZ4aX6q
— Philip Klotzbach (@philklotzbach) August 7, 2018