A rather messy evolution is once again anticipated, with extensive cloud and areas of showery rain, perhaps with embedded thunderstorms, across parts of central and southern Britain first thing on Wednesday morning. With time much of the general precipitation should weaken and decay, with cloud breaks allowing better surface heating across southern England and East Anglia, and potentially yielding 1,000-1,500 J/kg CAPE in places. Scattered heavy showers and a few thunderstorms may develop in response to sea breeze convergence and some upslope flow over the Downs, Dartmoor etc. Broadly east of the Isle of Wight the steering winds will attempt to push showers to the W or NW (ie parellel to the coast or even further inland), while west of the IoW showers/storms should drift offshore. Therefore, although shear is still relatively weak it is arguably stronger across SE England to enable some level of cell organisation, and (like Tuesday afternoon in Norfolk) an isolated supercell may just be possible. Any organised storms would be capable of producing hail perhaps to 2cm in diameter, and to a lesser extent strong gusts of wind. Perhaps of greater concern more widely in southern England and East Anglia is the risk of local flash flooding given slow-moving torrential downpours and potential for back-building, which is the primary reason for issuing a SVR.