@Ondřej-Šutera thanks for that. Yes I think it'd be a really handy feature to have since I think there are often times that many people want to see how much rainfall is forecast to fall today, tomorrow, the day after, etc.
And a 24 hour max lightning feature would also act as an extremely useful thunderstorm map for today, tomorrow, etc. I think you already use this technique for your wind accumulation option - if so, you could just use the same coding (but for lightning instead) without having to reinvent the wheel.