http://uk.news.yahoo.com/amazing-%E2%80%98tsunami-cloud%E2%80%99-hits-florida-coastline.html
Beachgoers were treated to a display of harmless fog with the appearance of large waves.
This phenomenon known as Kelvin Helmholtz instability can occur in the air or water. On this occasion it was rolling in from the Mexican gulf stream onto the Panama City Beach in Florida.
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