>Oh! Why did you know that? It was thundering yesterday.

Like I said, the humidity was high. That means there was a lot of water in the air, and thunder will come after that most of the time.

>The second from left is me.

So hot! @_@

>Tamaya~

Cool fireworks tradition! Do people still yell Kagiya~ or did Tamaya win in the end?

I hope I can help you by pointing out some mistakes in your post:

>I also didn't know the course

You probably mean 'source'.

>...continues today.(The most...

And between the . and ( should be a space. It's a detail but it looks nice. :)

>The most of the Japanese

That should just be 'Most of the Japanese'.

But besides these things you've explained it very clearly. I'm sure nobody will recognize you as Japanese when you anonymously post somewhere else on 4ch.
Remember that most native English speaking people on the internet make way more mistakes than you do.

My English isn't perfect either, feel free to correct me too! ;)

Let's keep contact and try to help each other, we can probably learn some interesting things! :)