There seems to be a bit of a disagreement between the GFS and ECMWF models about how much the low that’s forecast to track northeastward across IONA during Wednesday will deepen and it’s position at 12 UTC that day. The ECMWF develop a intense low (minimum central pressure ~958 hPa) that anchors itself for a while close to or over the northeast of Scotland by 12 UTC. In comparison the GFS model continues to keep progressing the low northeast towards Norway as a less intense feature (~972 hPa). This process will reintroduce colder air into the north. Hopefully the low will move away and allow colder air to feed south rather than having the rest of the week continually spiralling milder occluded air around it did just after Christmas.