The US Air Force and DARPA would like us to believe that they have stopped using HAARP in Alaska for research and experiment. Even then, we all know that there are other HAARP systems out there in the form of radar communication and surveillance systems that are rigged on top of mobile platforms that are deployable in any international waters around the world.
The technology behind weather modification is easy to understand and implement. Almost every nation on the planet could do it.
Weather is affected by atmospheric pressure which is in turn affected by its temperature. If we can control atmospheric temperature, we can create weather disturbances at will and in any place we want.