According to our definition of the NAO, models are calling for the all-time strongest -NAO value observed since our archive (beginning in 1980). The record low value since 1980 is from February 2006 (-2.77sigma). We are seeing models call for -3sigma during late February 2018. pic.twitter.com/6AY3SA3ESo

— Mike Ventrice (@MJVentrice) February 21, 2018