The cold front will move through Ireland and western Scotland on Friday morning in a highly sheared environment, helping to generate some convection within the frontal boundary. 50-60kts of deep layer shear will be present within that zone, along with low level forcing could help to generate a few lightning strikes, mainly in across northwestern Ireland and far western Scotland between 6z-12z on Friday. 

Behind the clearance of the cold front, upper level temperatures will cool, and with sea temperatures of 13-14C this will help to generate surface-500mb lapse rates in the region of 38-40C and ELTs nearing -20C (CAPE values reaching near 300J/kg). Showers should have sufficient depth to produce a few isolated lightning strikes, particularly near coastal regions of far northwestern Scotland overnight into the early hours of Saturday.