This is the point where I tend to embarrass myself...
The big split on the GEFS begins on the 22nd/23rd. Most Ens members show the low sinking S or SE over the UK, albeit with slight variations on the tracking options. With GFS, it's the next low steaming out of Newfoundland and how that is modelled. Most Ens members force it through over the top of the mid-North Atlantic ridge, which topples the high, initially over the UK.
ECM, on the other hand, also has the low sinking S'wards on the 22nd, but then doesn't develop the Newfoundland low to anything like the same extent. The result is that the mid-North Atlantic ridge develops into a more cut-off high directly north of the UK by 216.
Take the ECM to 240 and there's actually some [what looks like the beginnings of] retrogression, as a low to the UK's ENE builds and extends SW'wards.
Edited by user
15 January 2019 12:42:09
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Reason: Not specified
Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
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