Notice of Retraction: The Forecast of Tornado Variety Based on Function S-rough Sets

Abstract

The tornado speed is estimated according to its path length and width, but sometimes from the information detected by the Dopper radar, we found that the path length and the width of the tornado did not have intersection in wind speed ranks. Although the forecast of the wind speed rank is accurate, the wind speed may change owing to other unknown factors. Because it, these information is rough from its character which could not to express in accurate math's methods. We choose the max of the wind speed from any possibility in wind speed estimation, and forecast the wind speed possible change in the variational condition based on function singular rough sets. It was proved to be feasible and effective after tested.