Wind atmosphere based upon how far clouds move from one image to the next. Wind engineering describes the study of the effects of the wind on the built environment, including buildings, bridges and other man-made objects. Historically, the Beaufort wind force scale (created by Beaufort) provides an empirical description of wind speed based on observed sea conditions. Originally it was a 13-level scale, but during the 1940s, the scale was expanded to 17 levels. There are general terms that differentiate winds of different average speeds such as a breeze, a gale, a storm, tornado, or a hurricane. Within the Beaufort scale,
Ode to the West Wind flee from something that panics them. "chariotest" (6) is the second person singular. The "corpse within its grave" (8) in the next line is in contrast to the "azure sister of the Spring" (9)—a reference to the east wind—whose "living hues and odours" (12) evoke a strong contrast to the colours of the fourth line of the poem that evoke death. In the last line of this canto the west wind is considered the "Destroyer" (14) because it drives the last signs of life from the trees, and the "Preserver" (14) for scattering the seeds which will come to life