ELI5: If an exceptionally powerful El Niño were to develop, what could it realistically mean for Europe? Why can warmer waters in one part of the Pacific Ocean end up influencing weather thousands of kilometers away, and what are the worst-case scenarios for Europe?

ELI5: If an exceptionally powerful El Niño were to develop, what could it realistically mean for Europe? Why can warmer waters in one part of the Pacific Ocean end up influencing weather thousands of kilometers away, and what are the worst-case scenarios for Europe?