grammer
I think it should be "and snow".
See example:
A thunderhead , dense clouds that rise high into the sky in huge columns , produce hail, rain , or snow.
Padma Mannem
New member
2 answers 
Either "and" or "or" will work in this sentence. Using "or" emphasizes that rain, hail, and snow do not occur at the same time/place during a thunderstorm and is probably the technically correct choice (from a science standpoint). Using "and" is appropriate if you are just listing the possible results of the thunderhead.
Your verb -- produce -- should be in the singular form -- produces -- to agree with your subject -- thunderhead.
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answered Aug 22 '12 at 13:56
Jeff Pribyl
Grammarly Fellow
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I like Jeff's advice, and I also recommend separating the phrase "dense clouds that rise high into the sky in huge columns" with dashes instead of commas:
A thunderhead -- dense clouds that rise high into the sky in huge columns -- produces hail, rain, and snow.
That way, it's clear that the phrase is defining "thunderhead" rather than listing other types of clouds.
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answered Aug 22 '12 at 15:00
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