A temporary lull will follow under a transient ridge, before more substantial deep convection arrives across Ireland and SW Britain during Friday afternoon as a series of shortwave troughs approach from the Atlantic, within an environment of cold air aloft atop relatively warm SSTs yielding several hundred J/kg CAPE. Clusters of showers and a few thunderstorms are expected to grow upscale into a more organised band of rain during the evening and night hours as PVA increases from the south, with a messy mixture of dynamic and convective rainfall then pushing into many western, and later central, parts of Britain. Most of the lightning activity will probably be offshore and weaken approaching land, especially given rather moist profiles with skinny CAPE. A strengthening low-level jet will develop on the leading edge of this line, increasing low-level shear - however, winds look fairly uni-directional and so while strong, gusty winds will be possible (especially near embedded convection) this may limit the tornado risk somewhat.