A yellow storm warning for Thursday extends across Shropshire and Mid Wales, as well as the rest of the West Midlands, Wales and the South West.
However, the storms are easy to hit and miss, and many parts of the region manage to avoid them.
Neil Armstrong, a Met Office Chief Forecaster, said: “A period of rainy conditions in the summer always carries the possibility of some of those showers becoming heavy and thunderstorms, possibly with hail.
“Some of these showers will be slow, so that could increase the local impact, with rain totals of 30mm or more in isolated locations. In the heaviest showers, these could be accompanied by hail and lightning.”
The Met Office has warned that 10-20mm of rain could fall in an hour in some places, and a “little chance of 40mm in 2-3 hours”, expected to last longer in parts of central England and the Midlands.
Mr. Armstrong said the current regime of sunshine and showers will increasingly give way to brighter and warmer conditions for many, as a high pressure area will build from the southwest later next week.
“Tempers are expected to remain around average or slightly below average over the weekend, but the forecast of decreasing showers from Monday opens the door to temperature increases,” he added.
Shropshire weekend event organizers are keeping their fingers crossed that the dry weather forecast with sunny spells is turning out to be correct.
They include the Dragon Boat Racing on the Severn in Shrewsbury.