Discovery Channel HD

Teams of expert storm chasers and certified weather spotters risk it all to venture into America's Tornado Alley; they self-shoot their encounters with nature at its most extreme, warn people in harm's way and help save lives when disaster strikes.

While chasing a monster in Alabama, Sarah parts ways with Reed moments before he takes the Dominator for a spin inside a tornado; Gorilla hail bombards Freddy and Connor's chase vehicles; Brandon, Jordan and Aaron intercept a tornado at a gas station.

A rare northern outbreak draws veteran chasers across the Canadian border into unfamiliar territory. Back on home turf, Freddy, Tanner, and Connor race across Nebraska in pursuit of a powerful, long-lived twister that earns the title Tornado of the Year.

Josh needs a Hail Mary to save his season; Bryce, fighting to maintain his lead, faces difficulties in a race about speed; still reeling from his relationship drama, AJ is determined to prove himself in the final races of the Mud Cup.

It's the final race of the Mud Cup and four drivers are fighting for the $100,000 prize; a shocking controversy has thrown the championship into question, stunning the entire mud world.

In the Season 16 premiere, demand spikes for Tim and Tickle's duty-free shine, but big profits breed competition in the Virginia backwoods; Mark and Digger buy 90,000 bushels of surplus corn, but must run stills 24/7 to empty the grain silos in 60 days.

Tim and Tickle's tariff-dodging operation is threatened when a stranger appears at their still site; Mark and Digger face buyer's remorse over their $70K corn purchase; Jerry reaches his breaking point when Mike's $4K moonshine deal goes south.

Josh invests money he doesn't yet have to build a still site that doubles as a gold mine; Mark enlists Amanda and Kelly to distill liquor from surplus soybeans to prove Digger wrong; Mike returns to Tennessee and recruits a partner he burned once before.

Facing more demand for corn liquor than he can handle, Josh turns to Digger for help. Tim & Tickle discover their oddball neighbor is running an illegal moonshine operation of his own. Mike reunites with his old partner Daniel, while Jerry pays the price.

Tensions run high on the streets of Las Vegas as the year comes to a close; Elmer has a blowout with his boss; Pineapple rips into a new driver over their worst tow ever; Nick deals with a raging customer.

The crazies on the Strip keep the tow bros busy; TW goes toe-to-toe with an angry Elvis, and Jeremy contends with salty strip club clients while Pineapple senses déjà vu in a trucker's lot; Elmer is sent on a fool's errand.

A drunk man dressed like a giant baby refuses to let Shawn tow his car; a frightening find spooks Pineapple; during a call at a haunted house, the tow truck driver is terrified.

It's a race for the most tows as thousands of fans descend on Las Vegas for the Formula One Grand Prix; TW subdues a raunchy party while Shawn confronts a racegoer carrying a big wrench; Elmer's frustrations with The Tow Truck Company come to a head.

The ladies of Vegas give the tow truck drivers a run for their money when Pineapple fends off a bevy of bachelorettes in a bus; Kyle encounters a showgirl; Shawn faces off with Goliath and scores are settled between the tow companies.

Officers get intelligence on a passenger heading to London carrying an illicit load; when questioned, the man says he's meeting with Braveheart; a shipment of high-end construction equipment throws up red flags when its quality looks shoddy.

Officers inspect an old computer that looks like it's hiding something suspicious; a man entering with a commercial amount of Betta fish claims he's importing them for personal use, although the species is often bred for illegal fish fighting.

A shipment of cardboard packing supplies hides a lethal secret, and a laptop computer bag conceals a narcotic that even advanced technology has trouble identifying; agriculture specialists prevent a deadly pest from entering the country.

An elite team prepares for the extradition of a cartel Sicario, or hit man wanted for murder in his home country; with the sale of guns and ammo strictly controlled in Mexico, cartels turn to America for the weapons to wage their wars.

A new recruit hoping for her first drug seizure strikes it lucky; an unlikely smuggler is caught with nearly $50,000 in cash; officers find a fuel tank that's got more than gas inside it; a bus is searched after a K9 alerts to a strange smell.

As a man attempts to cross the border, he is flagged as having an outstanding manslaughter warrant; officers discover a secret stash of cocaine hidden inside a tractor-trailer; a woman caught with prescription pills is suspected of drug dealing.

After a gunfight outside a bar ends with two dead, Grand Rapids detectives discover that twin brothers are involved; the twins claim self-defense.

Anderson County, Tennessee, is federally recognized as an area affected by drug trafficking and gangs. With only one county jail, Sheriff Barker and his team combat crime while offering unique inmate reentry programs that reduce recidivism.

In Utah County, Sheriff Mike Smith runs a behavior-based jail, where good conduct earns inmates greater privileges and access to programs built to break the cycle of recidivism.

As a man attempts to cross the border, he is flagged as having an outstanding manslaughter warrant; officers discover a secret stash of cocaine hidden inside a tractor-trailer; a woman caught with prescription pills is suspected of drug dealing.