Ik vond deze tekst op https://www.netweather.tv/charts-and-data/gfs-para; helaas werkt de read-more link in deze tekst niet. Maar hier stelt men dat de parallelle run de toekomstige ge-upgrade hoofdrun is. 
The GFS has a major upgrade planned for January 2019, with the new model now running in parallel for testing, which you can view here. which you can read more about here. Please note that as a non-operational, parallel model it may not update on occasion.
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