S2S AO/AAO index forecasts

 Updated every day with a 21-day delay!
The latest initial date is 20241001.

Arctic Oscillation
Antarctic Oscillation

Initial time :
Year.Month
            Day


Definition of leading modes
is here


Initial days of forecasts:
centre Sun Mon Tue Wed Thu Fri Sat
BoM
CMA
ECMWF
ECCC
HMCR *1
ISAC-CNR *2
JMA *3
KMA
METFR *4
NCEP
UKMO
*1 HMCR: Wed (-31 May 2017), Thu (08 Jun. 2017-)
*2 ISAC-CNR: Mon (-16 Jan. 2017), Thu (19 Jan. 2017-)
*3 JMA: Tue,Wed (-15 Mar. 2017), Wed (22 Mar. 2017-15 Feb. 2023), daily (19 Feb. 2023-)
*4 METFR: 1st of each month (-Feb 2016), Thu (Mar. 2017-)


 NAO index

 AO/AAO indices

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