I am watching to see when this current heatwave will breakdown. This satellite image is showing a low pressure, cyclonic system out in the Bay of Biscay at this time. I think this low pressure will start to feed some instability and moisture into the southern parts of the UK possibly as early as Saturday. Timing is a little uncertain but at the moment Sunday looks like we could possibly see some thunderstorms reaching the midlands and the risk continues into the first part of next week.
So this is what I am watching at the moment.