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,
National Wind shares of the wind project, but instead are either paid a monthly lease or given royalties from the sale of electricity. On the other hand, National Wind's model aims to share both revenue and influence within local communities. National Wind develops and manages wind farms that produce, at minimum, 50 megawatts of renewable energy. Most of the company’s developments are located in the Midwestern United States in Iowa, Minnesota, North Dakota, South Dakota, Colorado, and Ohio. Currently, National Wind has twelve families of utility-scale wind projects in development or operation. National Wind Assessments, a subdivision of National Wind LLC, specializes