Tropical cyclone scales barometric pressure is low compared with its surroundings. Other classifications historically used include: cyclonic storm where the winds did not exceed force 10 on the Beaufort scale and a Cyclone where the winds are either force 11 and 12 on the Beaufort scale. Between 1924 and 1988, tropical cyclones were classified into four categories: depression, deep depression, cyclonic storms and severe cyclonic storms. However, a change was made during 1988 to introduce the category "severe cyclonic storm with core of hurricane winds" for tropical cyclones, with wind speeds of more than . During 1999 the categories Very Severe Cyclonic Storm
Daniel Cornelius de Beaufort succeeded by Samuel Grove. De Beaufort married Esther Gougeon and they had a son Daniel Augustus Beaufort (1739–1821) who was a priest and distinguished cartographer. His son was Sir Francis Beaufort (1774-1857), Royal Navy officer and hydrographer and the inventor of the Beaufort Scale for indicating wind force. In 1746, de Beaufort accompanied the Earl of Harrington to Ireland as chaplain and in 1747 he received the benefice of Navan, Meath. In 1753 he was appointed to be Provost of Tuam and he later became rector of Clonenagh. Daniel Cornelius de Beaufort Daniel Cornelius de Beaufort (1700-1788) was rector of