We need the pattern in the eastern USA to remain as amplified as possible especially as the low exits the ne around 96hrs, so yes this of course impacts the amplitude of the pattern in the Atlantic which in turn effects the displacement of the Azores high.
These small changes at that point domino into big changes in western Europe, for this reason until we get agreement on the pattern within 96hrs in the eastern USA then the output is liable to be wrong to some degree.
Thats not to say some big ne flow is on the way but that we may see the GFS move a bit more to the ECM/UKMO and hold the pattern further west, the next point of debate will be where low pressure near Iceland goes later, the block to the east could well force some energy more se rather than east.
We'll just have to try and at least get agreement within 144hrs before seeing what could happen there.
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