It's a real shame that the last few days didn't deliver for any of us Midlanders, but at least none of us will feel left out. As for the week ahead, its looking rather unexceptional with temperatures ever so slightly below average (warmer in the sun), and the jet stream pushing in atlantic lows which will probably end up bring patchy rain without thundery activity.
As for the long range:
Temperature-wise: Below-average to average on most days, possibly warmer by Friday into next weekend, but nothing exceptional expected for the remainder of August. Very slight indications of a hot spell (30C+) towards the end of August, but obviously this is too far off to be even slightly accurate.
Precipitation-wise: Considering most of August has been drier than average, yesterdays rainfall only made up for that in most places. Most of us will probably get patchy light showers on some days next week. Next Friday could bring some rain, or no rain. Next weekend will probably be wetter and into the week after, a very small chance of some big thunderstorms if the potential hot spell kicks off towards the end of August, although unlikely. Very average rainfall totals probable by the end of August.
As for thunderstorms, forecasting them in the long-range is pretty much entirely guesswork. Even forecasting them a day in advance is hard enough.