This Sunday, December 18, at 8pm, National Geographic is showing Tornado Intercept. This show highlights the use of the Tornado Intercept Vehicle (TIV), an armored monstrosity designed to be driven into the core of a weak (F-0 through F-1) tornado to collect scientific data, and film it with an IMAX movie camera. The TIV is really a modified 1997 Ford F-450 diesel pickup, engineered by IMAX cinematographers Sean Casey and Greg Eliason. The armor plating, 1/2" thick Lexan windows and other gizmos bring the weight of the vehicle up to 14,000 pounds, but it can still do 90 mph as it speeds off in pursuit of tornadoes. The TIV is equipped with a hydraulic system that lowers the vehicle flush with the ground, minimizing the risk of being overturned as a tornado's winds tear at the vehicle. The team is hoping to release an IMAX movie on tornadoes in 2008.