The Evaluation of Wind Chill Calculation Indexes

In this paper we have focused on one of the important climatic phenomena, namely, the wind chill effect. This feature is created through the combination of climatic elements such as temperature and wind under specific environmental conditions, by which the human welfare is disturbed. Under these conditions, the lower temperatures increases human stress and the possibility of body texture freezing. In fact, the level of temperature that causes freezing of boding limbs, is called Wind Chill index, and so far there has been several modelling standards and indexes in the literature. In this article, we have applied two famous indexes that have been alredy applied worldwide. These include Siple and Passel Indexs, and the second index is widely and practically used by Canadian and American meteorological organizations. After represe nting the oretical background, we have briefly introduced each Index, followed by the application of them for the calcutation of wind chill effect. The tables and standardized equations, and the mixture of climatic elements of temperature and wind have been utilized for Ahar City in north west Iran. A comparison of final models indicates that the equivalent wind chill temperatures of first Index have more difference with the real temperature. Accordingly, we propose the Canadian Meterological Index for the studyins of similar climatic conditions of north west Iran.