Two cyclones detected off the WA coast are predicted to create a rare weather phenomenon known as the Fujiwhara effect.
The Fujiwhara phenomenon occurs when two cyclonic systems rotate around each other. In tropical cyclones, the effect can happen when cyclones are within 1,400 kilometres of each other.
There is a risk of one of the systems hitting the far west Pilbara coast by the end of the week. However, the Bureau of Meteorology currently predicts the cyclones will have little onshore impact due to their distance from the coast.