Keeping a close eye on potential developments for Sunday. Of course it is very early days and things may not develop, but there is some reasonable potential for good strong thunderstorms to develop on Sunday as it seems a plume of moist, very warm air may well advect from the south of Europe. Areas most at risk look like to be the SE but there is quite a strong likelyhood of disappointment too.
If you are planning to be camping in northern France then the risk of severe storms is pretty strong. Be aware!
Will update as things become clearer.