Dvorak technique
Before 1971 and especially 1966, data in this basin is extremely unreliable. The geostationary satellite era began in 1966, and that year is often considered the first year of reliable tropical records. Intensity estimates are more reliable starting in the 1971 season. A few years later, the Dvorak technique came into use. Those two make intensity estimates more reliable starting in that year. For these reasons, seasons before 1966 are not included in the lowest column.