In the worst tornado outbreak in over half a century, Mississippi & Alabama are ravaged by hundreds of twisters. Towns are wiped clean off the map, and hundreds of people lose their lives.

A dangerous nighttime chase has team Dominator on a collision course with a tornado they can’t see. While team TWISTEX battles mechanical issues, the TIV team is becoming their own worst enemy.

After a tragic tornado outbreak in Alabama and Mississippi, all teams help with the recovery effort. Back on the chase, team TIV is determined to warn people, team TWISTEX is hoping to use their new radar.

Team Dominator takes the day off, but when Team TIV scores a victory in Reed’s own backyard, Reed vows to chase with a vengeance. Meanwhile, tensions within Team Twistex continue to rise as Tim grows more cautious while chasing storms in Kansas.

A tornado outbreak threatens to wreak havoc in team Dominator’s backyard. The TIV team follows their navigator’s bold prediction, with the success of their mission hanging in the balance. Tension threatens to derail team TWISTEX’s chase on a huge

Team Dominator risks everything to warn people in the path of a violent storm, but internal strife threatens to end their season early. Still gun shy after witnessing devastation this season, Sean Casey is trying TIV team’s patience.

It’s the last chase of the season, and Mother Nature is going out with a bang. Team Dominator is chasing a monster tornado for a radar intercept. Team TWISTEX has one last chance to deploy their probe in its path.

The Twetos brave the elements to deliver supplies to inaccessible areas.

Jim arranges to transport the casket of the dark winter's first casualty.

The Tweto family takes full advantage of Alaska's summer conditions.

The pilots brave the elements as hurricane-force winds roar into Alaska.

A Greenhorn pilot goes on the most challenging run of his short career.

The guys cope with an influx of teachers after the first snow.

Pilots embark on two white-knuckle flights involving something explosive.

Ariel's flying lessons end in disaster after a hard day of work.

Ariel attempts to learn the family business as Halloween takes over Alaska.