What is a bomb cyclone? Here's a simple explanation

As a major winter storm moves across the U.S. leading up to Christmas, you may have heard meteorologists mention the term "bomb cyclone" that could potentially cause major impacts on millions of holiday travelers this weekend.

Wind chills as low as -40 to -60 as dangerous blast of arctic air to tighten its grip on large part of US

Wednesday morning will see temperatures drop below freezing across much of the Midwest, even stretching as far south as Texas. In the Northern Plains, freezing temperatures will be as far as 50 degrees away with temperatures approaching minus 20 or colder.

'God laid over top of us': Woman recounts terror she felt as Louisiana tornado killed neighbors

An EF-2 tornado with winds estimated at 130 mph managed to decimate homes around Linda Barry as she huddled under a mattress protected by her soon-to-be husband, reciting the Lord’s Prayer for comfort.

Stunning strike: Sheriff's office captures video of lightning bolt hitting lot in Louisiana

The perfectly-timed recording came as severe weather, including violent tornadoes, was moving across the region. Tornadoes killed at least three people in Louiaiana on Tuesday and Wednesday.

Orlando weather: Severe weather exits state after strong cold front moves across Central Florida

A winter storm system moving across the South on Wednesday and Thursday spawned multiple tornadoes. Florida felt the brunt of that same system on Thursday which brought heavy rain, lightning, and damaging winds. As the system exits the state, it will usher in clear skies and cooler temperatures.

Tornado strikes New Orleans metro; damage surveys underway

About an hour after a violent tornado damaged a hospital and homes in New Iberia, the severe weather threat moved into the New Orleans metro area. The multi-day severe weather event has produced tornadoes from Texas to Louisiana.

3 killed in Louisiana as severe storms tear across South

One person died in Killona, Louisiana on Wednesday after a possible tornado swept through the area. A mother and child died on Tuesday after a tornado hit Keithville.

TIMELINE: Powerful winter storm heading toward Florida could bring severe weather, tornadoes

Big changes are on the way to end the week as a strong front rolls through Thursday afternoon bringing the threat for severe storms followed by the coolest air of the season.