die ik vond op netweather
GFS and GEM H5 ensemble means day 11-15:
http://raleighwx.easternuswx.com/models/cmcensemble/12zCMCENS11-15day500mbHeightAnomalyNH.gif
http://raleighwx.easternuswx.com/models/gfsensemble/12zENS11-15day500mbHeightAnomalyNH.gif
CPC day 8-14 anomaly:
http://www.cpc.ncep.noaa.gov/products/predictions/814day/814day.03.gif
There is more flow going northward, as evidenced by tendency in relative angular momentum,
http://www.esrl.noaa.gov/psd/map/images/reanalysis/aam_total/gltend.sig.90day.gif
(look 40-50N - westerl wind increase)
... but the response should be for a mid latitude high at worst. Therefore, ECM 12z is an outlier
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