Beaufort scale used in Taiwan and mainland China, which are often affected by typhoons. Internationally, WMO Manual on Marine Meteorological Services (2012 edition) defined the Beaufort Scale only up to force 12 and there was no recommendation on the use of the extended scale. Wind speed on the 1946 Beaufort scale is based on the empirical relationship: Where "v" is the equivalent wind speed at 10 metres above the sea surface and "B" is Beaufort scale number. For example, "B" = 9.5 is related to 24.5 m/s which is equal to the lower limit of "10 Beaufort". Using this formula the highest
Ode to the West Wind a prophet who does not only bring "black rain, and fire, and hail" (28), but who "will burst" (28) it. The "locks of the approaching storm" (23) are the messengers of this bursting: the "clouds". Shelley also mentions that when the West Wind blows, it seems to be singing a funeral song about the year coming to an end and that the sky covered with a dome of clouds looks like a "sepulchre", i.e., a burial chamber or grave for the dying year or the year which is coming to an end. Shelley in this canto "expands his vision from