Overnight, a frontal zone will head northwards across England, Wales and Ireland, associated with a surface low drifting northeastwards towards the Irish Sea. Some pockets of marginal CAPE may exist within the warm sector / close to the cold front, and more especially behind the cold front as a marked mid-level dry intrusion (and associated steep mid-level lapse rates) spreads across the Irish Sea / western Britain during the early hours. As such, a few sporadic lightning strikes may be possible, but most areas will likely remain void of lightning.