Brits are facing heavy snow during a -4C Arctic blast in March - with 5cm of snow falling per hour. Advanced weather modelling maps show the cities which are going to be worst affected by a low pressure system sweeping in and mixing with cold northerly air by March 4. The GFS weather model indicates that around midday the worst of the flurries will come in northern regions, although Cardiff and Birmingham can also expect some snow. Manchester , Liverpool , Newcastle , Belfast , Glasgow and