I must be honest I have worked for the company in question and have also operated in parts of the world were the thunderstorms tower to + 40,000 ft.
A health respect needs to be adopted for these beasts of Mother Nature
I did notice a general lack of awareness and understanding among the crew I flew with when it came to thunderstorms. They often didn’t feel it important or necessary to giving that red section of the thunderstorm plenty of distance.
4 a/c of same company on same day sounds a bit fishy, but if you think about the number of Ryanair a/c out there flying every day then its not impossible that 4 Ryanair a/c could have passed or been caught in the same weather formation in a relatively short space of time from each other but going to different destinations.
Just a though, happy flying, from thunderstorm country.