Produced by GNUPLOT 4.4 patchlevel 2 980 990 1000 1010 1020 1030 1040 2011 01 2012 01 2013 01 2014 01 2015 01 2016 01 2017 01 2018 01 2019 01 0 50 100 150 200 250 300 Atmospheric pressure (mbar) Azores-Iceland (mbar) Year Sat Nov 17 09:21:15 2018 Belfast Azores Iceland Azores-Iceland

NAO Reference: http://polarmet.osu.edu/NAO/

METAR files: http://weather.noaa.gov/weather/metar.shtml

Archive of current indices