Shuǐlóngjuǎn shì lóngjuǎnfēng zài shuǐmiàn shàng de xíngtài.
A waterspout is a tornado in its over-water form.
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memory
Pairs with 龙卷风 (lóngjuǎnfēng) 'tornado' — literally 'dragon-rolling wind.' Swap 风 'wind' for 水 'water' and you get the over-water version. The dragon imagery is apt: ancient texts described waterspouts as dragons sucking water up to the sky.