The Great Thunderstorm of Widecombe-in-the-Moor on Dartmoor, according to the Wikipedia article took place on Sunday, 21 October 1638, when the church of St Pancras was apparently struck by ball lightning during a severe thunderstorm. An afternoon service was taking place at the time, and the building was packed with approximately 300 worshippers. Four of them were killed, around 60 injured, and the building severely damaged as the tower and roof were ripped off. It's hard to believe that now, when you stand back and look at the church as I did just a few days ago that such a calamity ever befell it, but then again it did happen almost 378 years ago.
According to an article entitled "Jan Reynolds and the Devil" on the website Legendary Dartmoor website says that Widecombe has been called the ‘valley of thunderstorms’, and that the number of dead might have been as many as 21. The late great L C W Bonacina has an account of it in an early edition of the Weather Magazine (Volume 1, Issue 4, August 1946, Pages: 123–125), and it may be as well as being hit by a severe thunderstorm and lightning, Widecombe may have also have laid in the track of a tornado due to the amount of damage done to the church and surroundings. The weather setup at the time sounds a lot like a 15th century "Spanish Plume" event, with severe thunderstorms, wind and hail sweeping right across the southwest of England that day.