@idefix37 Gotcha, but then the use of l (litre) as one of the SI symbols for volume is confusing. I don't think there's a SI symbol for lightning but ⚡︎ should make it much clearer what that number is meant to represent as there's no alt text explaining it on neither the pin drop flag nor the density scale.

This (see image) should show l/m² (litres per square metre which is equal to mm used elsewhere on Windy) I believe.