Bitter Arctic air plunged more than half the United States into a deep freeze Tuesday, including New Orleans, where the heaviest snow in decades brought dangerous conditions to the famously festive Gulf Coast city.

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It's like "bomb cyclone" or "firenado." It seems like the sort of phenomenon that would be responsible for the record-breaking blast of cold, snow and wintry conditions that reached all the way to the Gulf Coast this week.

Some of that snow was already on the ground when an arctic air brought record-setting cold to the mountains along the Tennessee-North Carolina state line. The National Weather Service warned night time temperatures would fall below zero in many areas, and wind chills of minus 20 degrees were possible.

After millennia as a carbon deep-freezer for the planet, regional hotspots and increasingly frequent wildfires in the northern latitudes have nearly canceled out that critical storage capacity in the permafrost region,

I’ve been convinced that we are about to experience a very serious and dangerous weather episode,” Houston Mayor John Whitmire said Sunday.

A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of the arctic blast.

HOUSTON — All Houston airports will close Tuesday due to the winter storm expected in the area, officials said Sunday. An arctic front with wintry precipitation is expected to move into the area overnight Monday.

A blast of Arctic air is bringing cold weather to New England over the next several days. Wind chill values in the mornings are going to be 0 to 15 below, with the coldest areas across the hillier terrain of Worcester County and the Berkshires.

You can send photos and videos of the snow in your area, or of how you and your family are waiting out the winter weather.

During the arctic blast over the weekend, Denver reached minus 11 degrees, but some places across Colorado were even colder.

U.S. President Donald Trump signed an executive order on Monday repealing former President Joe Biden's efforts to block oil drilling in the Arctic and along large areas off the U.S. coasts, according to the White House.