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Please advise which of the following is correct:

It rained heavy / heavily yesterday.

Thanks.
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We need an adverb here, so the answer is heavily.
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It rained heavily yesterday.
It's heavy raining or heavily raining? !
Orpheus We need an adverb here, so the answer is heavily.

heavy may also be used as an adverb. See: http://www.dictionary.com/browse/heavy (#34)

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Once your green tree thrives

You can climb above…

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Even if that day heavily rains...

Once your green tree thrives

You can climb above the fray

And view the crowds below

Even through a heavy rain