Maximum sustained wind 50% of the geostrophic wind speed aloft; while over open water or ice, the reduction is between 10% and 30%. In most basins, maximum sustained winds are used to define their category. In the Atlantic and northeast Pacific oceans, the Saffir–Simpson scale is used. This scale can be used to determine possible storm surge and damage impact on land. In most basins, the category of the tropical cyclone (for example, tropical depression, tropical storm, hurricane/typhoon, super typhoon, depression, deep depression, intense tropical cyclone) is determined from the cyclone's maximum sustained wind. Only in Australia is this quantity not used to
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