CID knows criminal measures the strength of the blow at the airport
I believe the answer is:
windsock
Can you help me to learn more?
(Other definitions for windsock that I've seen before include "It indicates the direction and strength of the wind at ground level" , "Indicator of air movement at airport" , "Indicator of breeze direction at airfield" , "shower of blows" , "Mounted cloth cone showing wind direction" .)