Cyclone Montha has moved further north-northwest and intensified into a severe cyclonic storm. After intensifying into a cyclonic storm on Monday, it strengthened further into a severe cyclonic storm. In terms of intensity, the Met Office classifies cyclones into four categories:• Wind speeds between 62 and 88km per hour -- cyclone. • Wind speeds between 89 and 117km per hour — severe cyclone. • Wind speeds between 118 and 219km per hour — cyclone with hurricane-force winds.