Spring weather: 28M face severe conditions amid tornado alerts

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Strong, Deadly Winds Create Dangerous Conditions Across U.S.

Ernest Hemingway wrote that "when spring came, even the false spring, there were no problems except where to be happiest."

So you can knock the nation's midsection off the list of "where to be happiest" places.

Some 28 million Americans from Louisiana north to Iowa were expected to get a last blast of winter Wednesday with blizzard conditions in some places along with high winds, flash flooding, large hail and tornadoes, NBC News meteorologist Bill Karins warned.

And April was expected to roar into the northern states like the proverbial March lion with a surge of arctic air Friday that could blanket the upper Great Lakes region and parts of the Northeast with freezing temperatures and possibly even some snow, according to The Weather Channel.

Related: Deadly Gusts Prove Why 'March Winds' Are Legendary

Come Saturday, the mercury will struggle to reach the lower 40's and the highs in some areas near the Canadian border may not rise out of the 20s.

Meanwhile, the areas at greatest risk Wednesday of being nailed by tornadoes stretched from northeast Texas into northern Louisiana and western Mississippi, Karins said.

Isolated tornadoes were also possible from Arkansas to Iowa, he said.

Karin said that heavy rain expected over the next two days could see the return of flooding to Louisiana, Alabama and Mississippi.

"Northern Texas — including Dallas — have the highest chance to see tornadoes today," Weather Channel senior meteorologist Juan De Cardenas said. "This is normally the time of the year on the Plains for severe weather. This is pretty much on time."

See more from the recent blizzard to hit Colorado:

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Spring weather: 28M face severe conditions amid tornado alerts
DENVER, CO - March 23: Airline passengers brave blowing snow during a blizzard at Denver International Airport March 23, 2016. Hundreds of flights were canceled. (Photo by Andy Cross/The Denver Post via Getty Images)
DENVER, CO - March 23: Airline passengers check the monitors only to see hundreds of canceled flights due to the blizzard at Denver International Airport March 23, 2016. (Photo by Andy Cross/The Denver Post via Getty Images)
DENVER, CO - March 23: A woman scrapes off her windshield during a blizzard at Denver International Airport March 23, 2016. (Photo by Andy Cross/The Denver Post via Getty Images)
LAKEWOOD, CO - MARCH 23: Bus computers shelter behind the bus stop along Colfax Ave. in Lakewood as snow continues to fall, March 23, 2016. The Denver area is under a blizzard warning until 6 p.m. as a heavy band of snow is expected to combine with gusty winds up to 39 mph. (Photo by RJ Sangosti/The Denver Post via Getty Images)
LAKEWOOD, CO - MARCH 23: A man try to get his shopping cart to his car as snow continues to fall in Lakewood, March 23, 2016. The Denver area is under a blizzard warning until 6 p.m. as a heavy band of snow is expected to combine with gusty winds up to 39 mph. (Photo by RJ Sangosti/The Denver Post via Getty Images)
LAKEWOOD, CO - MARCH 23: Luis Valdez clears snow from the walkways outside Westwood Inn Restaurant in Lakewood as snow continues to fall, March 23, 2016. The Denver area is under a blizzard warning until 6 p.m. as a heavy band of snow is expected to combine with gusty winds up to 39 mph. (Photo by RJ Sangosti/The Denver Post via Getty Images)
DENVER, CO - MARCH 23: Stephanie Lugo (left) and Jule Coppa (right) speak with Thomas Ricketts as they volunteer with Christ in the City in Lincoln Park. The missionary group gathers at the park every Wednesday to feed and build community with the city's homeless population. Denver received more than a 10 inches of snow on Wednesday, March 23, 2016. (Photo by AAron Ontiveroz/The Denver Post via Getty Images)
DENVER, CO - MARCH 23: Cori Echevarria walks down 13th on Capitol Hill. Denver received more than a 10 inches of snow on Wednesday, March 23, 2016. (Photo by AAron Ontiveroz/The Denver Post via Getty Images)
BOULDER, CO - MARCH 23: Jennifer Severs navigates slush and large downed branches as she walks along 9th street with her dog Buddy on March 23, 2016 in Boulder, Colorado. Heavy wet snow left many without power and broke branches from big trees. (Photo by Helen H. Richardson/The Denver Post via Getty Images)
BOULDER, CO - MARCH 23: Liza Greifinger talks with a friend on the phone and admires the amount of snow that has fallen on March 23, 2016 in Boulder, Colorado. Heavy wet snow left many without power and broke branches from big trees. (Photo by Helen H. Richardson/The Denver Post via Getty Images)
DENVER, CO - March 23: An airline passenger makes their way to the Westin Hotel at the Denver International Airport in bitter winds and heavy snow March 23, 2016. (Photo by Andy Cross/The Denver Post via Getty Images)
DENVER, CO - March 23: Airline passengers and a pilot make their way to the Westin Hotel at the Denver International Airport in bitter winds and heavy snow March 23, 2016. (Photo by Andy Cross/The Denver Post via Getty Images)
DENVER, CO - March 23: Snowed in vehicles on top of the west side parking garage at Denver International Airport March 23, 2016. (Photo by Andy Cross/The Denver Post via Getty Images)
DENVER, CO - March 23: Folks head over to the Westin Hotel at the Denver International Airport in bitter winds and heavy snow during a blizzard March 23, 2016. (Photo by Andy Cross/The Denver Post via Getty Images)
HIGHLANDS RANCH, CO - MARCH 23: Roads in Highlands Ranch were slushy after an overnight blizzard dumped snow March 23, 2016 in Highlands Ranch. (Photo By John Leyba/The Denver Post via Getty Images)
HIGHLANDS RANCH, CO - MARCH 23: An overnight blizzard dumps snow weighing down the trees and covering this face on the tree in the Indigo Hills subdivision March 23, 2016 in Highlands Ranch. (Photo By John Leyba/The Denver Post via Getty Images)
HIGHLANDS RANCH, CO - MARCH 23: An overnight blizzard dumps snow covering the swings in the Indigo Hills subdivision March 23, 2016 in Highlands Ranch. (Photo By John Leyba/The Denver Post via Getty Images)
HIGHLANDS RANCH, CO - MARCH 23: An overnight blizzard dumps snow burying the fire hydrant in the Indigo Hills subdivision March 23, 2016 in Highlands Ranch. (Photo By John Leyba/The Denver Post via Getty Images)
HIGHLANDS RANCH, CO - MARCH 23: An overnight blizzard dumps snow weighing down the trees in the Indigo Hills subdivision March 23, 2016 in Highlands Ranch. (Photo By John Leyba/The Denver Post via Getty Images)
HIGHLANDS RANCH, CO - MARCH 23: An overnight blizzard dumps snow weighing down the trees and covering signs in the Indigo Hills subdivision March 23, 2016 in Highlands Ranch. (Photo By John Leyba/The Denver Post via Getty Images)
DENVER, CO - MARCH 23: Miranda Klein walks from the Denver Art Museum to her Home down 14th as snow falls. Denver received more than a 10 inches of snow on Wednesday, March 23, 2016. (Photo by AAron Ontiveroz/The Denver Post via Getty Images)
DENVER, CO - MARCH 23: A man walks in front of the Capitol Building. Denver received more than a 10 inches of snow on Wednesday, March 23, 2016. (Photo by AAron Ontiveroz/The Denver Post via Getty Images)
DENVER, CO - MARCH 23: Joelle Pierre walks down 14th as she waits for a bus to take her home on Capitol Hill. Denver received more than a 10 inches of snow on Wednesday, March 23, 2016. (Photo by AAron Ontiveroz/The Denver Post via Getty Images)
DENVER, CO - MARCH 23: Matt Campagnoli rides a Burton powder surfer in front of the Colorado State Capitol. Denver received more than a 10 inches of snow on Wednesday, March 23, 2016. (Photo by AAron Ontiveroz/The Denver Post via Getty Images)
DENVER, CO - MARCH 23: Robert and Courtney Butker play with their dog, Rocky, on Capitol Hill. Denver received more than a 10 inches of snow on Wednesday, March 23, 2016. (Photo by AAron Ontiveroz/The Denver Post via Getty Images)
LAKEWOOD, CO - MARCH 23: A home is covered in snow during a spring storm in Lakewood, March 23, 2016. The Denver area is under a blizzard warning until 6 p.m. as a heavy band of snow is expected to combine with gusty winds up to 39 mph. (Photo by RJ Sangosti/The Denver Post via Getty Images)
LAKEWOOD, CO - MARCH 23: A willow tree is seen through falling snow in Lakewood, March 23, 2016. The Denver area is under a blizzard warning until 6 p.m. as a heavy band of snow is expected to combine with gusty winds up to 39 mph. (Photo by RJ Sangosti/The Denver Post via Getty Images)
NEDERLAND, CO - MARCH 23: Rural mailboxes are covered in snow on March 23, 2016 in Nederland, Colorado. Over 14 inches of snow fell in the area overnight and into the day. The slow moving storm caught people by surprise with the amount of snow it dumped in a short amount of time. (Photo by Helen H. Richardson/The Denver Post via Getty Images)
LAKEWOOD, CO - MARCH 23: Brian Veltman try to save his trees and shrubs from breaking in heavy snow outside his home Lakewood, March 23, 2016. The Denver area is under a blizzard warning until 6 p.m. as a heavy band of snow is expected to combine with gusty winds up to 39 mph. (Photo by RJ Sangosti/The Denver Post via Getty Images)
ARVADA, CO - MARCH 23: Cows huddle together along State Hwy 72 trying to block the steady blowing snow thats blanketing the area March 23, 2016 in Arvada, CO. (Photo By Joe Amon/The Denver Post via Getty Images)
Pedestrians struggle to climb the hill south of the State Capitol as a spring storm packing high winds and wet, heavy snow blanketed Denver Wednesday, March 23, 2016. The wet, heavy snow and strong winds have crippled travel in north central Colorado, shutting down some highways and schools and even Denver's airport. (AP Photo/David Zalubowski)
A bicycle is encased in wet, heavy snow as a spring storm blankets downtown Denver early Wednesday, March 23, 2016. The wet, heavy snow and strong winds have crippled travel in north central Colorado, shutting down some highways and schools and canceling flights at Denver's airport. (AP Photo/David Zalubowski)
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This severe weather was forming as warm moist air moved inland from the Gulf of Mexico and met cool air from the West. As the two fronts meet, it creates a "shear" between the layers of air in the atmosphere.

"The low-level jet transfers warm moisture from the Gulf and high-level jet brings cold air from the West and Southwest to create a shear in the atmosphere," De Cardenas added. "This helps create a spin which forms tornadoes."

The heavy snow will subside later Wednesday in Wyoming — where more than a foot has fallen around Casper, Karins said.

Moving into Thursday, the storms will head east across the South bringing the threat of tornadoes to Mississippi and Tennessee.

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