Now Iāll add GSO 6ā+ storms since 1950 that werenāt also at RDU to the RDU 6ā+ list that I already showed the PNAs for to list what the most negative PNA of all of these was:
6ā+ storms since 1950 at GSO and/or RDU: most negative PNA:
-1.1: 2/12-13/2014 (moderate +NAO)
-0.8: 1/22-24/1954 (moderate +NAO)
-0.8: 3/2-3/1960 (neutral NAO)
-0.7: 1/6-7/2017 (moderate +NAO)
-0.5: 3/9/1960 (neutral NAO)
-0.3: 12/26/2010 (moderate -NAO)
-0.3: 2/24-26/2015 (strong +NAO)
-0.2: 2/27/1987 (weak -NAO)
-0.1: 2/18-19/1979 (neutral NAO)
-0.1: 1/12-14/1982 (neutral NAO)
-0.1: 2/26-27/2004 (weak -NAO)
-0.1: 1/17/2018 (strong +NAO)
Note that of these 12 big RDU/GSO storms since 1950 with PNA<0, almost half (5) had a moderate or strong +NAO, only 25% (3) had a -NAO, and none had a strong -NAO.