Race Rulers, Rain & Ruin - What happens when wet weather hits the F1 track?

Throughout Formula 1's history wet weather races have occurred and in the first half of the 2025 season, there have been two F1 races hit with rain – the season opener in Melbourne and the British Grand Prix. In both instances, mixed up weather led to mixed up results. With that in mind, Autosport asks what happens when the rain falls on an F1 race and what measures are in place to ensure racing still goes ahead?