"Season 3 (2009)
Filming of the third season began and is currently underway and will include the orignal TIV crew, TVN crew with an updated vehicle called the SRV Dominator, Vortex2 Team led by Josh Wurman and a new team known as TWISTEX led by veteran storm chaser Tim Samaras along with Carl Young and Tony Laubach. This season also includes modified and new vehicles on the original teams including a new 2009 Jeep to take the place of the old SCOUT vehicle and a new vehicle nicknamed the TIV Doghouse."
Wiki says there is a season 3.