Interesting...
Permalink
but this came up from years ago. I looked up the PDO in December 1917, and the PDO was a negative 0.52. La Nina was in place in the Tropical Pacific. I read that was the coldest and Snowiest begin to Winter 1917 - 18 that was ever recorded in the CONUS. Interesting that in January 1918 the PDO was a positive 0.42. Apparently, low readings in the PDO plus La Nina was responsible for the very harsh Winter 1917 - 18. I also looked up the AMO (AMV) and from 1880, and has been slowly climbing from that year to now. The AMO in 1917 - 18 was strongly negative and now strongly positive and the PDO is a negative 2.88. Appreciate any thoughts on this scenario.