Tiger in a Tropical Storm or Surprised! is an 1891 oil-on-canvas painting by Henri Rousseau. It was the first of the jungle paintings for which the artist is chiefly known. It shows a tiger, illuminated by a flash of lightning, preparing to pounce on its prey in the midst of a raging gale.

Henri Julien Félix Rousseau was a French post-impressionist painter in the Naïve or Primitive manner. He was also known as Le Douanier, a humorous description of his occupation as a toll and tax collector. He started painting seriously in his early forties; by age 49, he retired from his job to work on his art full-time.