tornadoes (my theory) it has been a difficult task to measure 50feet below in the towering twister ,but I just propose my theory.......why not record wind speed in a small tornado in the tornado stimulator?Record the wind speed there at 50feet and compare the highest wind speed at the upper sections.See how much it is slower than highest wind speed(e.g 2/3or 5/7)and use the data to compare with the highest wind speed of a real monster?This solution with not put anyone at risk as it does not includ going near a tornado and set down a million dollar instument. My theory may sound like rubbish ,but who knows?