Elsewhere, scattered showers are likely over portions of Ireland behind the main frontal rain during this evening, generally in an arc spreading northeastwards. Given the strongly-sheared profile, with looping hodographs and marked low-level jet, any convection that can become rooted within the boundary layer may exhibit some organisation / supercell characteristics - and as such, an isolated tornado cannot be ruled out. Despite relatively weak CAPE, the strong shear and a marked mid-level dry intrusion suggests some sporadic lightning will be possible. 

Later in the night, an increase in deep convection and showers will evolve over the Celtic Sea, which may produce some sporadic lightning also. 

A low-end SLGT has been introduced, but confidence in coverage of lightning is not particularly high. It is possible an additional low-end SLGT may be required for parts of the Hebrides (such as Skye) for the overnight hours too, depending on how things evolve.