Latest forecast for Yorkshire direct from the met office:
Thursday generally dry and very cold again with maxima barely above freezing except perhaps briefly in town/city centres and right along the east coast. Thursday night should stay dry but during Friday morning the main area of snow is set to gradually encroach from the west, this then spreading slowly NE’wards across the region on Friday morning and then liable to continue throughout the rest of Friday and through much of Friday night, tending to get lighter with time before gradually dying out from the south in the early hours of Saturday morning. Accompanying the onset of the snow will be a freshening SE’ly wind with the potential for blizzard conditions to develop for a time over higher elevations with considerable drifting of the snow (winds should ease down during Friday night). After the main band of precipitation has ceased the remainder of Saturday looks largely dry (a few residual snow flurries) but very raw and overcast and an important point to emphasise is the continuing cold. Temperatures post-snow are unlikely to rise appreciably so that any thawing of lying snow (low levels only) will be a slow process. Fog may become an additional hazard by Saturday evening/night.
It will be a miracle if it's on..