By Bradley Jolly Most of the country will endure heavy downpours and thunderstorms on Sunday – after several days of sweltering sunshine. The Met Office has issued several yellow weather warnings for thunderstorms across Sunday and Monday. The end to our glorious weather will be abrupt, as temperatures are likely to exceed 24C again today \- but fall as downpours hit tomorrow. The worst of the weather is expected to be in western and central areas on Sunday afternoon, with storms thought to be so severe power cuts could happen. Some of the weather warnings are in place until 4am on Monday, the…