The Tropical maritime airmass that gave us high temperatures of 15ºC on Thursday has gone now and has been replaced by an Polar maritime airmass. This means we are drawing in cold air from the Greenland/Iceland region.
There will be another widespread slight frost Friday night. In Pennine areas there will be a number of showers will which fall wintry (hail, sleet,snow) on higher ground.
In Pennine districts 1-2 cm snow may accumulate above about 200 m by Saturday morning with with 2-5 cm possible above 300m. Small amounts of snow are possible at low levels too.
Despite the cold weather it will be bright and clear with long spells of sunshine, especially away from the Pennines. So, wrap up warm and enjoy it if you can. The Met Office Ice warning can be found here