First winter storm blankets Rockies, High Plains

Before you go, we thought you'd like these...
Before you go close icon
First Winter Storm Hits Colorado

A blizzard warning that saw parts of Kansas and Nebraska and much of northeastern Colorado — including Denver — bunkered in Monday night will continue well into Tuesday, forecasters warned.

Heavy snow was at the heart of the first severe winter storm of the season, spreading through the Rockies and into the High Plains. As it continues on its way east, it is expected to cause flooding later in the week along the Gulf Coast as severe thunderstorms move across the South.

The leading eastern edge spun off snow and harsh winds Monday as far east as Nebraska and Kansas, where scattered tornadoes were even reported. Flagstaff, Arizona, was buried under 11 inches of snow.

Tornadoes Rip Through Texas Panhandle
"I woke up at 5 o'clock to rain. By 6 o'clock, it was snowing, and by 6:30 it was sticking on the parking lot when the school bus pulled in," Phil Mack, owner of Mount Lemmon's General Store in Summerhaven, Arizona, told NBC station KVOA of Tucson.

Metropolitan Denver and its 650,000 people were ground zero.

"Well into the day and evening on Tuesday, we'll have snowfall across eastern Colorado and western Kansas, as well as Nebraska," said Danielle Banks, a meteorologist for The Weather Channel. "Some spots could pick up more than two feet."

See photos from this year's snowy season in Colorado:

3 PHOTOS
Snowy season in Colorado
See Gallery
First winter storm blankets Rockies, High Plains
DENVER, CO - NOVEMBER 11: A blanket of white snow covers Fort Logan National Cemetery during a Veteran's Day snow storm the moved into the area overnight, November, 11, 2015. (Photo by RJ Sangosti/The Denver Post via Getty Images)
LAKEWOOD, CO - NOVEMBER 11: Brandon Nelli, a student at Colorado Christian University in Lakewood, shovels snow during a Veteran's Day snow storm the moved into the area overnight, November, 11, 2015. Lakewood got almost 3 inches in some areas form the storm. (Photo by RJ Sangosti/The Denver Post via Getty Images)
HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

As much as 12 inches of new snow was expected by Tuesday morning in Denver and two other major population centers, Vail and Colorado Springs, the National Weather Service said. The town of Limon, in Lincoln County, could get 18 inches, it said.

Authorities called for residents to avoid all travel in the warning area through Tuesday — including major roads like interstates 25, 70, 76 and 80 in Colorado, southern Wyoming, western Nebraska and northwest Kansas.

Denver International Airport canceled 218 arrivals and departures Monday, with 160 more delayed. The airport went ahead and canceled 126 of Tuesday's arrivals and departures ahead of time.

The storm was born in the Gulf of Alaska, where temperatures dropped as low as 24 below zero Monday morning the small community of Bettles — unseasonably cold for mid-November even by Alaska standards.

RELATED: Take a look back at some of last winter's snowiest storms:

36 PHOTOS
Northeast snowstorm - snow - storm - winter weather
See Gallery
First winter storm blankets Rockies, High Plains
CHICAGO, IL - FEBRUARY 01: A man walks down a snow-covered street on February 1, 2015 in Chicago, Illinois. Fifteen inches or more of snow is expected to fall on the city before Monday morning. The snow has caused power outages and forced about 2,000 flight cancelations at the city's airports. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 01: Passengers walk through snow to catch an L train on February 1, 2015 in Chicago, Illinois. Fifteen inches or more of snow is expected to fall on the city before Monday morning. The snow has caused power outages and forced about 2,000 flight cancelations at the city's airports. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: A man walks through Humboldt Park on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
WASHINGTON, DC - FEBRUARY 21: A woman with a red umbrella walks on a snow covered pavement during snowfall as Washington is affected by the cold weather called 'Siberian Express' on February 21, 2015. (Photo by Erkan Avci/Anadolu Agency/Getty Images)
A woman jogs in the snow outside the White House in Washington, DC, on February 21, 2015. Some 3 to 5 inches (7.5 to 12.5 cm) of snow are expected in the US capital. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
People walk in the snow past the White House in Washington, DC, on February 21, 2015. Some 3 to 5 inches (7.5 to 12.5 cm) of snow are expected in the US capital. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
A man jogs in the snow outside the White House in Washington, DC, on February 21, 2015. Some 3 to 5 inches (7.5 to 12.5 cm) of snow are expected in the US capital. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
Ice covers 94 percent of Lake Erie on February 19th, 2015. 
CAMBRIDGE, MA - JANUARY 27: Snow covers a car on January 27, 2015 in Cambridge, Massachusetts. Boston, and much of the Northeast, is being hit with heavy snow from Winter Storm Juno. (Photo by Maddie Meyer/Getty Images)
NEW YORK, NY - FEBRUARY 02: A plaw moves down a snow covered street on February 2, 2015 in the Brooklyn borough of New York City. Another winter storm has brought inclement weather to much of the Northeast, canceling schools and hundreds of flights throughout the area. (Photo by Spencer Platt/Getty Images)
NEW YORK NY - FEBRUARY 02: Michael Musto rides his bike through the snow in Soho on February 02, 2015 in New York City. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - FEBRUARY 02: Cars drive at slow speed during a snow storm in Manhattan, New York City on February 02, 2014. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)
NEW YORK, NY - FEBRUARY 02: Cars drive at slow speed during a snow storm in Manhattan, New York City on February 02, 2014. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)
NEW YORK, NY - FEBRUARY 02: A man rides a bicycle on a snowy and icy Manhattan street on February 2, 2015 in New York City. Another winter storm has brought inclement weather to much of the Northeast, canceling schools and hundreds of flights throughout the area. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - FEBRUARY 02: Pedestrians navigate the snow, ice and puddles along a Manhattan street on February 2, 2015 in New York City. Another winter storm has brought inclement weather to much of the Northeast, canceling schools and hundreds of flights throughout the area. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - FEBRUARY 02: A teen looks out of a Brooklyn subway window during a storm bringing a wintery mix of snow and ice to New York City on February 2, 2015 in New York City. Another winter storm has brought inclement weather to much of the Northeast, canceling schools and hundreds of flights throughout the New York metro area. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - FEBRUARY 02: People walk during a snow storm in Manhattan, New York City on February 02, 2014. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)
NEW YORK, NY - FEBRUARY 02: People walk during a snow storm in Manhattan, New York City on February 02, 2014. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)
CHICAGO, IL - FEBRUARY 02: Marcus Neris digs his car out of the snow on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: Marcus Neris digs his car out of the snow on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: A residents clears snow from a car on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: Brittany OBerien (L) and Jessica Moser (R) dig their car out from the snow on February 2, 2015 in Chicago, Illinois. Snow began falling in the city yesterday morning and did not stop until this morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: Residents dig their cars out from the the snow on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: Residents try to free a stranded car after it became stuck in the snow on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: Brittany OBerien (L) and Jessica Moser (R) dig their car out of snow on February 2, 2015 in Chicago, Illinois. Snow began falling in the city yesterday morning and did not stop until this morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: Residents try to free a stranded car after it became stuck in snow on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: Cars are burined in snow along a residential street on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: A man clears snow from the sidewalk in front of an aprtment building on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: Residents dig their cars out from the snow on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 02: A dog plays in the snow in Humboldt Park on February 2, 2015 in Chicago, Illinois. Snow began falling in the city Sunday morning and did not stop until early Monday morning, leaving behind 18 inches. It was the fifth largest snowfall in the city's history. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 01: Aryn Sothbarr clears snow from the sidewalk outside her home on February 1, 2015 in Chicago, Illinois. Fifteen inches or more of snow is expected to fall on the city before Monday morning. The snow has caused power outages and forced about 2,000 flight cancelations at the city's airports. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 01: A man digs out his car along a snow-covered street on February 1, 2015 in Chicago, Illinois. Fifteen inches or more of snow is expected to fall on the city before Monday morning. The snow has caused power outages and forced about 2,000 flight cancelations at the city's airports. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 01: A cyclist takes cover from the snow on February 1, 2015 in Chicago, Illinois. Fifteen inches or more of snow is expected to fall on the city before Monday morning. The snow has caused power outages and forced about 2,000 flight cancelations at the city's airports. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 01: Pedestrian and motorists navigate a snow-covered street on February 1, 2015 in Chicago, Illinois. Fifteen inches or more of snow is expected to fall on the city before Monday morning. The snow has caused power outages and forced about 2,000 flight cancelations at the city's airports. (Photo by Scott Olson/Getty Images)
CHICAGO, IL - FEBRUARY 01: Drew Maurer clears snow from the sidewalk outside his home on February 1, 2015 in Chicago, Illinois. Fifteen inches or more of snow is expected to fall on the city before Monday morning. The snow has caused power outages and forced about 2,000 flight cancelations at the city's airports. (Photo by Scott Olson/Getty Images)
HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

More from NBCNews:
Water too warm for cod in U.S. Gulf of Maine, stock near collapse
Hawaii's first rocket launch fails midflight: U.S. Air Force
Apparent meteor streaks across Thailand, turning night sky green

Read Full Story

From Our Partners

Man Finds 5 Abandoned 'Puppies' In His Garden - Then Quickly Realizes He Made A Big Man Finds 5 Abandoned 'Puppies' In His Garden - Then Quickly Realizes He Made A Big
A Holocaust Survivor Found These Old Photographs - And Solved A Decades-Old Mystery A Holocaust Survivor Found These Old Photographs - And Solved A Decades-Old Mystery
Don't Get Too Close To a Newborn Giraffe Unless You Want to Get Kicked in the Nuts Don't Get Too Close To a Newborn Giraffe Unless You Want to Get Kicked in the Nuts