Perhaps a greater chance of lightning will be over the Celtic Sea during the early hours of Thursday as heights fall from the west, cold air aloft then steepening lapse rates and generating a few hundred J/kg CAPE in response to SSTs. Given various forecast parameters, have issued a low-end SLGT for late Wednesday night - though some complications from what seemingly begins as deep convection eventually manifests itself into more of a frontal feature due to increasing baroclinicity by Thursday morning. Confidence is not particularly high for this SLGT, and trends will be monitored to remove it if necessary.