Florida, New Jersey, and Massachusetts have much denser coverage than the rest of the country, and it's correlated strongly with the state boundaries. It makes me question the accuracy of the data. I'd expect Florida to have the most overall, but the pattern looks odd.
The split between sexes might be understandable by different preferences for outdoor activities, a gradual regional variation would be explainable by different probabilities to actually have lightning storms there but why these sudden jumps? Different reporting mechanisms with data going missing or some thresholds or something like that?
