A system of verifying anemoscope in tobacco specific smoking machine was designal.The theory and component parts of this system was introduced and the method of velocity at a fixed point was modified.
The horizontal nonhomogeneity of the background wind and pressure fields influences the term of the inertial force in the motion equation and the wind speed at the upper boundary of the PBL.
According to the field survey, the tornado occurred at the time that the 2nd TVS occurred, it is located on the south side of the TVS, and consistent with the southern fringe of mesocyclone.