Abstract: A method and an arrangement for preventing a formation of a hurricane storm and/or dispersing a tropical cyclone storm defining an eye are disclosed. The arrangement is dropped from an aircraft into water in the eye of the storm and includes at least first and second vessels filled with a refrigerant. The first and second vessels are pressure resistant, spherical and sinkable with the first vessel having a first sinking velocity and the second vessel having a second sinking velocity. The first sinking velocity is greater than the second. The first and second vessels have respective first and second opening mechanisms for releasing the refrigerant at pregiven respective depths. The first opening mechanism is configured to open at a first depth and the second opening mechanism is configured to open at a second depth. The first depth is greater than the second depth.