Tropical cyclones produce strong perturbations of atmosphere and the ocean surface accompanied by acoustical radiation. Infrasonic signals in the 0.1−0.5 frequency band can be observed at distances of thousands of miles from the cyclone. The effect of infrasound radiation is connected apparently to the interaction of the counter-propagating sea-surface waves that produces a sound radiation of the doubled frequency of the surface wave oscillation. This radiation has narrow-angle vertical directivity pattern. The essential refraction of radiated infrasound in the atmosphere perturbed by the cyclone leads to trapping of the infrasound by the horizontal atmospheric wave-guide providing its long distance propagation.