You would have thought that the Met Office had every possible impact contingency covered in the warnings that are currently in place, but you would be wrong. As warm air pushes slowly in from the west on an active frontal system, a band of snow has developed across higher parts of southern England and the southeast, forcing them to issue a very late warning for those parts at 0820 UTC this morning (fig 2). High Wycombe looks to be getting a dollop at 10 UTC (fig 1) and I wonder how cars on doing on Wycombe hill at the moment? I would have thought the local impact of a quick 10 cm of snow might warrant something higher than just a yellow.
This is the second time recently that the area of a warning for snow hadn’t been extended far enough south (fig 3). If you remember it happened on the 11th of December when High Wycombe ended up with 17 cm of ‘partly cloudy’.