Chasing has been a part of Tim's life for over 25 years. Ten years ago, he developed his own tornado probes to record meteorological data inside of tornadoes. On June 24, 2003, Tim dropped a probe in the path of an F-4 tornado where it measured an astounding 100 millibar pressure drop - a record that still stands today. Tim runs the scientific field program, TWISTEX (Tactical Weather Instrumented Sampling in Tornadoes Experiment, www.twistex.org). Their mission is to help understand why tornadoes form in order to increase warning times in Tornado Alley.
Last year, Tim had a successful probe deployment on the last chase of the season in Grand Island, NE. This year, TWISTEX is introducing new instruments to help them meet their scientific goals, including a new probe called TOWER. This new probe features multiple anemometers to measure wind speed and direction, cans of smoke to track circulation, and a brand new 360-degree camera mount. In addition, Tim is conducting research for Boeing, testing the effects of large hail on the company's new aircraft. 
On May 31st 2013 Tim, his twenty-four year old son Paul, and forty-five year old long time chasing partner Carl Young passed away chasing a tornado in El Reno, Oklahoma.