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
Scale Force Scale Force Scale Force is considered the highest waterfall in the English Lake District. Opinions vary about how its precise height is calculated, but the total height is normally stated as 170 feet (51.8m). It lies on the stream Scale Beck. The waterfall – or force (a Norse term for waterfall) – is hidden in a deep gorge on the northern flank of Red Pike. It lies south of Crummock Water and is near the village of Buttermere. William Wordsworth described Scale Force as "a fine chasm, with a lofty, though but slender, fall of water", while Samuel Taylor Coleridge