There is a Japanese drama called あした天気になあれ. Its Chinese name is "Good Weather Tomorrow". Can anyone tell me what になあれ means? Thank you.

あした天気になあれ is a commonly used sentence among Japanese people.

That is, I hope there will be good weather tomorrow.

Naあれ is just the long sound of なれ. Nana was transformed from Nana.

This word does not appear in the dictionary. It is just one of many daily expressions that Japanese people like to use.