I'm feeling the way a lot of people felt the week before the Beast from the East. Several runs in a row showed the same screaming Easterly but every day there was some kind of spanner in the works appearing - warm air undercutting from the South and giving us sleet, or dry air overriding from the North giving a frosty but dry one. In the end we had largely cold but dry but with enough snow to look pretty here, and others had a shedload of snow.
The risks this time are 1. cloud incursions - it seems to have been abnormally cloudy recently, particularly the low stuff, 2. the high slipping too quickly to the East letting the rain in (as shown in 06 and 12z GFS yesterday) or 3. the high staying to the West and cold air coming down from the North around the top (as shown in a number of GFS and GEM ENS runs).
The dream scenario is - almost but not quite - shown in GFS 06z: a long heatwave, then what looks like a brief but dryish breakdown, then a reload. I love reloads, they make the end of a hot spell so much more bearable.
Brockley, South East London 30m asl