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 most reliable starting in the 1971 season. A few years later, the Dvorak technique came into use. Those two factors make intensity estimates more reliable starting in that year. For these reasons, seasons prior to 1971 are not included.