A group of 16 elite skiers and snowboarders on a back-country adventure in Washington state hear a 25-foot-high wall of snow thundering toward them. Someone yells “Avalanche!” Ski patrol soon confirm that three of the skiers are dead. And, the myth that a tornado can never strike in the mountains is exploded when a twister strikes a Kentucky town in the Appalachian foothills.

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A flash flood in the Texas Hill Country kills 13 people and destroys 350 homes. A father watches helplessly as his house is pulled down the river, and his wife and two children are tossed into the current. And, when a twister hits a small town in Mississippi, a family takes shelter in a diner’s walk-in cooler. When they emerge, the town is gone.

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As Hurricane Harvey hammers Houston, Texas, it becomes the most extreme rainfall event in US history. A local realtor heads out in his boat to rescue a woman and her family. And, in the midst of a violent winter storm, a harbormaster in a Massachusetts town is trying to tether a boat to the dock when he falls into the raging waters.

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A mudslide in Washington State, triggered by heavy rainfall, rips through a hillside community, killing 43 people. First-responders dig 15 feet through the mud, finding some survivors in homes next to dead loved ones. And, the strongest November tornado ever recorded in Illinois hits a small town, as a man races home to see if his children are alive amid the debris.

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Record-setting floods devastate Nashville, Tennessee. A woman is rescued by a neighbor on a Jet Ski just before her house goes up in flames, while two teenagers, trapped in their Jeep, are carried away by the current. And, the US Air Force races to evacuate from Tyndall AFB when it’s right in the path of a monster hurricane called Michael.

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Two powerful tornadoes take aim at a Nebraska farming community at the same time.   Bank employees take cover in a vault, while a mother and her daughter are buried in the rubble.  And, a super-rare but super-dangerous tornado of fire terrorizes a California town.  It's a race against the clock to escape this colossal “firenado."

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