Today there were at least 20. Six people were known dead as of this evening.
From Arkansas to Missouri to Illinois, the funnel clouds came out of nowhere today in the worst outbreak of twisters on a New Year's Eve in 50 years.
In northwest Arkansas, a tornado obliterated a house and killed three people in the tiny town of Cincinnati. The violent weather then moved northeast into Missouri, killing three more before heading into Illinois.
Watch "World News with Diane Sawyer" for more on this story tonight on ABC.
In Sparta, Mo., Jessica Barnes and her three-year-old son were lucky to survive as a twister passed.
"I placed him in the tub first and then laid on top of him," Barnes said. "When we came to, he was actually on top of me and first thing he said was my house is broken. There were some boards laying on top of us, and I somehow managed to get them off of me and then screamed out for help from my neighbors."
Tornadoes are extremely rare this time of year, but those that do occur are often deadlier because they move faster in the cold air, leaving less time for warnings.
Across the country, rough weather came today like an unwelcome guest.
Blizzard warnings were in effect today for parts of Wyoming, Nebraska, Minnesota and the eastern Dakotas, according to the National Weather Service.
The central and northern Rockies and portions of the Midwest are under several winter storm watches and warnings.
On the Las Vegas strip today, people preparing to party were shivering from the cold. In Arizona, rare snow flurries dusted the desert around Phoenix, and the Denver area received about half a foot of snow overnight.
Blowing snow in North Dakota led to a massive pile-up Thursday along Interstate 94 west of Fargo. The chain reaction accident involved up to 100 cars and trucks.
In Arizona, a rare blizzard dumped a foot of snow on higher elevations and shut down Interstate 17 Thursday overnight.
Air and ground transportation systems across the country appear to be getting back on track, as millions of people prepared for the new year.
But there are plenty of trouble spots facing people from California to New York who're still recovering from the extreme weather conditions this past week.
In New York, neighborhoods are still digging out from the blizzard that hit the northeast Sunday and Monday in spite of the city's promise that all the streets would be plowed by now.
At the nation's airports, some passengers remain stuck in a travel limbo.
Alexander Frank, visiting family in Chicago, hoped to celebrate New Year's Eve in Denver.
But getting there won't be easy.
"Either fly to Baltimore on this 12-hour hell journey or fly on the first and miss all my plans and what not," Frank said this morning. "So it's a big nightmare."
While the backlog from the East Coast blizzard begins to ease, only 3 percent of Americans traveling this weekend are flying.
The vast majority of travelers, about 9 in 10, are hitting the road.
The American Automobile Association estimates that more than a million people will find themselves stuck and stranded on the side of the road.