The intensity of a cyclone is described according to a numerical scale of 1 – 5, with 5 being the highest category. Watch this video to understand cyclone categories and impacts. For the latest forecast and warning information on Severe Tropical Cyclone Ilsa, expected to cross the coast between Port Hedland and Bidyadanga in Western Australia Thursday night or Friday morning, visit our website: http://ow.ly/55A650NHKT3 Know your weather. Know your risk. | Bureau of Meteorology