Structure of space vector field & inevitability of weather disaster

There is a space vector field which structured with the atmospheric wind and direction. In this paper, we define a modular map with the solution curve crossed any point in the vector field. According to the conclusion that Euler´s characteristic of spherical surface is equal to 2, it´s proved that there exists at least one fixed point in the modular map. By analyzing and discussing the fixed point, we can illustrate ulteriorly that the existence of weather disaster is inevitable.