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It has been revealed that a waterbender can access moisture in the air, as was demonstrated by Hama in "The Puppetmaster". However, there would not be enough for a tsunami, seeing as how there is only about 10% of water in the atmosphere at a time. Theoretically, even if there was, a tsunami is probably way too much water for an ordinary bender to control, and might be a special attribute specific for Avatars.