Abstract
Power spectra of three components of wind speed near the ground in strong winds are investigated from the standpoint of the theory of isotropic turbulence. Gusty winds due to a typhoon were recorded with an ultra sonic anemometer. Power spectra of the data were estimated by the autoregressive method. The power spectra in nondimensional form were compared with the values based on the theory of isotropic turbulence. The observed power spectra of the lateral wind speed didn't agree with the theoretical values, while those of the longitudinal wind speed agreed well with the theoretical values.
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