This is getting ridiculous - peak AO index values in recent ECMWF HRES (10-day) runs:
— World Climate Service (@WorldClimateSvc) February 13, 2020
Feb 12 00Z +6.4
Feb 12 12Z +7.3
Feb 13 00Z +7.6
We've capitulated and expanded the scale on our AO graphics to accommodate the extreme.
1950-present record (set 3 days ago) is +6.3 pic.twitter.com/UrQb9UAZmx