A broad warm sector will develop across Ireland and southern Britain on Saturday with temperatures rising widely into the 20sC (locally mid-20s in southeast England). However, this area will remain capped to convection throughout the period (and likely through much of Sunday as well). A cold front will begin to spread into western Ireland by late evening on Saturday and continue to move eastwards into the early hours of Sunday. The frontal forcing and associated PVA may tap into small amounts of mid-level instability (less than 200 J/kg of MUCAPE) and allow for some embedded convection along and just ahead of the cold front. If this occurs some lightning could be possible in the early hours on Sunday (0z-6z), however at this stage it is not expected to be very widespread.