We refer to very heavy rainfall as a "sheet" of rain, one we can't see past. If the wind is strong as well, we have sideways sheets of rain. It's also sometimes known as 'horizontal rain'.
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Anonymous Hi! Could you please explain what 'sideways sheets of rain' means? Thank you.Here is a picture for you (see the top left picture): http://www.pfoust.com/trips/trips2005f.shtm