How should the information about thunderstorms on the meteogram be interpreted?

We are introducing information on storms on an experimental basis for the time being. The colours of the circle fillings indicate:
• white: possibility of thunderstorms
• yellow: weak storm up to 10 discharges per hour in one mesh (4x4 km)
• orange: moderate thunderstorm up to 30 discharges per hour
• red - severe storm above 30 discharges per hour
How storms are determined is described in a separate section.