You don’t know what the NAO is?
And I’ve linked references to the TNH multiple times. CPC references it as a seasonal/cold season index, but it’s present in some form year round.
https://www.cpc.ncep.noaa.gov/data/teledoc/tnh.shtml
To be fair, that's SEA and they've been an outlier on the cool side with anomalies. Seattle city office was +1.0 for March, and is running +.7 for April.
Overall, not a torchy spring so far, just a bit above normal most places.
I think the summer is going to be stuck in a >XKZ/HLT pattern under WFG+/ABC- conditions, due to the HVJE/KSUF forcing in the +1A-HDW region of the JSHDW/North Antarctic Ocean, causing a mass FNEO× pattern in the PRHEU layer of the atmosphere. This summer is going to be a peak HFHSOUF/IFGDSJ- pattern in the east coast, and a UFHEJ+ pattern in the west coast. Just my opinion based on the HDGS/PAHF/IAHC+×-< forcing.
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