Teacher Discussion Forums

I'm looking for a good exercise or explanantion for our use of the word "though," when used as an intensive.
It is so natural for me to know when we do and don't use it in informal speech, that it is difficult to explain. Examples of the usage that he's questioning:

Speaker 1: Today would be a good day to go hiking.
Speaker 2: Isn't it supposed to rain, though?

Speaker 1: Maybe, but look outside...it's sunny.
Speaker 2: I bet it's raining in the valley, though.

Any help or formal explanations would be appreciated.

I acknowledge the information preceding this statement, but here is some information which carries some different implications.

(As an explanation, it's a bit long winded though )

just a slightly more informal alternaive to 'however, I bet it's raining in the valley' (if being a non native I am right)

"Though" is used like "but" to give information contrary to what is expected or an opposite point of view. "Though" can be put at the end of a sentance but "but" can not be.