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Read this phrase in a blog. I think the basic meaning of the phrase 雨よ雪に変わってくれ is "The rain is changing into snow." But I don't understand the usage of よ in this case. Is it a particle? Or is it a typo?

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See also: How to invoke God/spirits in Japanese. – senshin Dec 22 '13 at 3:28
Related: japanese.stackexchange.com/a/12401/78 – istrasci Dec 22 '13 at 4:47
You are talking to the rain. The よ is NOT a typo. – l'électeur Dec 23 '13 at 8:36
up vote 13 down vote accepted

It's a vocative particle, like the English vocative "O" in the following example:

O Rain! Please change into snow!

It sounds poetic or literary.

It's defined as 係助詞「よ」 in 集英社国語辞典:


I bolded the meaning, which is basically vocative.

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