http://www.cpc.ncep.noaa.gov/products/people/wwang/cfs_fcst/images3/glbz700Mon.gif
Taking another look at this, it appears that the model expects low pressure to be more often south of the UK than running past the northwest, with high pressure often extending across from the west and east to give the most settled conditions from the midlands north.
This is somewhat at odds with the current GFS and ECM output, which keeps the low pressure belt further north with any high pressure from the west and east tending to influence the south the most.
This was updated last Saturday, during a time of great model confusion regarding the progression through the rest of this month, so that may explain the differences.
Looking at July, we can see that the Greenland blocking is gone, with high pressure quite close to our east but also troughing close to our southwest. Given that these are expected anomalies for the whole month, there is room there for some fine, hot weather but also some cooler (if still muggy and probably warm when nights are factored in) more unsettled interludes. Given the situation with June, I guess this prediction has to be taken with a whole teaspoon of salt
August, on the face of it, looks like being the most average month ever seen across the Atlantic
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