@Jacko-Jaxon
These scales both for Thunderstorm and for Rain accumulation are correct.

l/km2 means lightning per square kilometre. Could you imagine 1 lighting per square metre? (It’s not litres per square kilometre)

Rain accumulation can be the accumulation of rain over 10 days and 1m (1000mm) is not a non sense ! This is possible in tropical regions as shown here some weeks ago: