james - the ECM op made a pigs ear of the strat split at the turn of the year compared to gfs. This evolution to displaced Siberian vortex was trailed by the gfs prior to day 10 when we are able to see ECM version. Clearly, a couple of days ago, ECM decided that this mid/upper strat profile would downwell almost immediately into the trop. andrej on NW showed a 3D representation of the upcoming displacement which showed the trop euro trough being a direct result of the upper strat activity.
Now ECM has kept with the solution (op and ens) whilst gfs toyed with it on a couple of runs before deciding it would not be as deep nor as far west as a consequence. More Azores influence. I wonder if the extra vertical resolution of the ECM is resolving the situation better than gfs? I certainly wouldn't expect the gefs to necessarily see it and especially post day 8.
I also note note that over recent ECM ens runs, the attempt to split the vortex through n Greenland from the Alaskan ridge continually wavers as the ECM ens enter their low res post day 10.
Im in not saying there is anything in that but whilst the high res ens keep the feature at day 10, I continue to wonder if it will be more of a player in the 10/15 day period than currently modelled.
rst
Originally Posted by: nickl