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Typhoon Tip was the largest and most intense tropical cyclone on record. As the nineteenth tropical storm, twelfth typhoon, and third super typhoon of the 1979 Pacific typhoon season, Tip developed out of a disturbance in the monsoon trough on October 4 near Pohnpei. Initially, a tropical storm to its northwest hindered the development and motion of Tip, though after it tracked further north Tip was able to intensify. After passing Guam, it rapidly intensified and reached peak winds of 305 km/h (190 mph) and a worldwide record low pressure of 870 mbar (hPa) (25.69 inches of mercury) on October 12. At its peak strength, it was also the largest tropical cyclone on record with a diameter of 2220 km (1380 mi).