Since it can survive very high winds and hail, the TIV provides a good opportunity to collect tornado data. Inside the TIV are a variety of meteorological instruments, including:
Another weather research tool, the Doppler on Wheels (DOW), also uses the same instruments in addition to a mobile Doppler radar. The DOW, however, must stay between two and eight miles away from a tornado. Since the TIV houses the same instruments as the DOW, scientists can combine their data to create a more complete picture of the life of a tornado.
Now, let's look at what happens when the TIV finds a tornado.