Cumulonimbus and aviation at this altitude, updraughts with speeds that can exceed . Such an updraught speed corresponds to the wind speed of a small hurricane. The speed can even exceed . The maximum number in the Beaufort scale is 12 ("hurricane force" wind) and is assigned to wind speeds of 64 knots or greater. If the Beaufort scale were extended, these updraughts would have a Beaufort number of 14 "in the vertical direction". The turbulence is then "extreme" at this altitude. Moreover, the diameters of the updraught columns vary between 2 km (air mass thunderstorm) and 10 km (supercell thunderstorm). The height
Duchess of Beaufort name from a place outside the British Isles. The family seat is Badminton House near Chipping Sodbury in the unitary authority of South Gloucestershire. The principal burial place of the Dukes and Duchesses of Beaufort is St Michael and All Angels Church, Badminton. Traditionally a widowed peeress puts "Dowager" in her style. If a widowed peeress is also predeceased by the next Duke, any surviving widow of that Duke does not use the style of Dowager until the current dowager has died or remarried ("see" Courtesy titles in the United Kingdom: Widows). Duchess of Beaufort Duchess of Beaufort is a