Today's wind is cold... Really ..
"Today's wind is cold" should be accepted.
Why doesn't the sound work?
If sound isnt working, report it please.
When is "i" used before kēia lā?
When it is used an an expression of time and not when kēia lā is the subject of the sentence.
Compare these two -
It is cold today. = Anuanu i kēia lā.
Today is cold. = Anuanu kēia lā.