South Dakota spins up the twister of the season, and the non-stop tornado action leaves no room for drama.

Reed's cannons are locked and loaded, but multiple tornados prove a hard target for an itchy trigger finger. Tim's team chases in the tornado twilight zone, while Sean weathers a storm of controversy.

Storm and chasers collide in Minnesota for a final showdown. As a ferocious EF-4 twister targets the town of Wadena, one team finds themselves in the wrong place at the right time, and Sean's trial by fire becomes a race to save others.

It’s the most violent tornado season in over fifty years, and on the year’s first chase there’s a storm headed toward downtown St. Louis. While team TWISTEX chases too close to the beast, team Dominator is on the verge of falling apart. TIV team h

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.

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.

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.

In the frigid Alaskan town of Unalakleet, the Tweto's and their family-run airline battle the arctic elements to transport supplies and passengers to some of the most inaccessible areas on the planet.

Pilot Luke Hickerson transports dangerous chemicals from Barrow to the remote village of Atqasuk. Then, in Unalakleet, the cold and dark winter claims its first casualty and Jim must make arrangements to transport the casket.

In a dangerous mission, pilot Doug Doherty flies along Russian airspace to transport volatile explosives to the island of St Lawrence. In Unk, Ben slams into a large bird mid-flight.

Unseasonably warm weather sends Jim up to the Brooks Range to look for potential landing strips. Ferno and Ariel prepare an Eskimo feast for returning pilot John Ponts and the week ends with an icy plunge into the Unalakleet River.

In Bethel, construction crews race to finish Era's newest hanger before the unforgiving winter snows arrive. But when Jim flies in to inspect the progress, he is far from happy. In Unk, fierce crosswinds blow John Ponts' tiny 207 all over the sky.