Jon-Cameron Bates

Thanks for answering so quickly! And I am glad I asked as I have been inadvertently misinterpreting these symbols for a couple of years now!

Sorry if this really is a newbie question! But on the lightning detector map, there is a small Key/Legend graphic (coloured crosses and 1-10 mins, 11-20 mins etc etc) Can someone explain what the timings refer to? I am unsure if it means the duration of the storm, or when the storm is due to hit, or if it means something else.