The Met Office 120-hr MSLP forecast shows a strong NW'ly with a
WARM front across the country, moving SE. I've never seen this before
but it ties in well with the 96-hr prediction and appears not to be a
mistake. A minor cold pool precedes the front, which makes sense, but
the GFS prediction has the thickness decreasing northwards (deduced by
mental gridding).
You can get southward-moving warm fronts in winter when Atlantic
air pushes round the top of a High to the west but in this case the
origin of the warm air seems to be NW Russia. Most unusual, and
especially in July. I just can't picture what sort of weather it will
bring. Any comments, anyone?

Tudor Hughes, Warlingham, Surrey.