Discovery Channel HD

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.

Near Gary, S.D., expert chasers and certified weather spotters self-shoot an encounter with a long-track, shape-shifting tornado; when the twister takes a turn towards an occupied farmhouse, chasers are thrust into the role of first responders.

The team's investigations converge as Bryce, Mireya and Russell discover tree structures on different sides of the same mountain; as a storm approaches, Bryce prepares an AI-powered surveillance array that will help pinpoint Bigfoot's location.

Rick's crew sends a rock truck careening off the road; Tony goes rogue and buys a new wash plant to get his Indian River operation back up and running; Parker increases his gold target, pushing Rocksand to the limit.

LDWF biologists on a conservation mission get hands-on with black bear cubs, facing a protective mama bear; hunters get caught using a banned method to hunt ducks; wildlife agents stake out after dark for a felon with an illegal gun.

A suspicious driver leads wildlife agents on a high-speed chase through a national forest; goose-hunting guides are caught in a repeat offense; a routine stop turns treacherous when a suspect is discovered concealing a firearm.

When a pair of illegal hunters flee by truck, wildlife agents set out to track them down; heaps of trash dumped at a fishing spot lead to a suspect who denies any wrongdoing; damning evidence in a truck bed catches a hunter in a lie.

A bizarre discovery inside an abandoned cooler escalates a littering probe; wildlife agents patrolling in dense fog are thrown into a dangerous encounter, and a burglary investigation uncovers an illegally taken deer.

A suspicious man fleeing on the levee after dark puts wildlife agents in danger; a first-time bowhunter could lose his kill over a major violation; agents question a duck hunter with an attitude who seems to be hiding something.

Caddo Parish Correctional Center is struggling with a staffing shortage, the inmates outnumber the deputies by 180 to one; to ensure the safety of both inmates and staff alike, the Emergency Response Team springs into action.

Inside Butler County Jail, a six-term sheriff and his seasoned staff confront an unrelenting opioid crisis. As drugs flood the facility, officers work to dismantle the supply ring and maintain order.

In Bristol County Jail, half of the cells don't lock; as changing demographics bring in more violent, gang-affiliated criminals, staff must manage a higher-risk population without the facility slipping into chaos.

Over-capacity and on the brink, Louisiana's Washington Parish Jail is spiraling into chaos; the new sheriff struggles to bring stability and control while facing the mistakes of the past.

Virginia Beach is a party town with a vibrant nightlife, making its Correctional Center one of the busiest city jails in the state; here, some inmates arrive to go on vacation, then leave on probation, and return on a violation.

An officer catches a woman trying to use a forged visa to get into the U.S.; a rookie officer takes part in a cocaine seizure; officers suspect a traveler claiming to be a pastor on the way to a religious conference may not be who he says he is.

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.

K9s save the day, identifying gallons of paint and beer bottles filled with more than the officers bargained for; a man with a warrant for his arrest is concealing something suspicious; officers question the intentions of a chatty traveler.

A driver claims he buys used cars over the border to import into the U.S., but an X-ray reveals something suspicious in his spare tire; when a traveler returning from Mexico declares protein-rich snacks at Customs, a Fish and Wildlife expert is called in.

Following the work of America's Customs and Border Protection agency, whose job is to defend the border and stop terrorists, drugs and illegal weapons from entering the country.

In New Mexico, a mother clings to her car when a carjacker steals it with her babies inside; just before dawn in Arizona, a SWAT team must locate an individual spotted inside a pawn shop packed with guns.

In rural Leake County, Mississippi, a small jail battles a big meth problem; with repeat offenders entering the jail daily, local law enforcement works to break the cycle.

Inside one of Nevada's busiest jails, deputies battle a non-stop surge of arrests driven by Reno's constant crime and a major trafficking corridor; with gangs entrenched inside, keeping rival groups apart becomes a daily fight for control.

Following the work of America's Customs and Border Protection agency, whose job is to defend the border and stop terrorists, drugs and illegal weapons from entering the country.