The given sentence is theoretically grammatical, but awkward-sounding and difficult to say because of the two "-ly's" in a row. It would be better as one of the following: We have extremely heavy rain. The rain is extremely heavy.
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The given sentence is theoretically grammatical, but awkward-sounding and difficult to say because of the two "-ly's" in a row. It would be better as one of the following:
We have extremely heavy rain.
The rain is extremely heavy.
The rain is heavy in the extreme.
It's raining cats and dogs.
It's raining so heavily I can't breathe.