A 47-degree drop in Denver in 2 hours. Here are some of the other dramatic temperature changes

The major winter storm crossing the nation is causing dramatic declines in temperatures across the central US as arctic air pushes south and east.

Some highlights:

Casper, Wyoming

(Mountain time)

In less than 18 hours, from 7:40 a.m. Wednesday to 1:35 a.m. Thursday, the temperature dropped 70 degrees.

7:40 a.m. Wednesday: 28 degrees.

8 a.m. Wednesday: 3 degrees.

Casper dropped 25 degrees in just 20 minutes Wednesday.

1:35 a.m. Thursday: minus 42 degrees

6:00 a.m. Thursday: minus 35 degrees with a wind chill of minus 76 degrees.

LIVE NEWS: Winter storm and severe cold sweeps across the US

Thermometer on snow shows low temperatures - zero. Low temperatures in degrees Celsius and fahrenheit. Cold winter weather - zero celsius thirty two farenheit.

Stay safe and warm with this winter weather guide

Denver

(Mountain time)

Dropped 65 degrees in 16 hours.

12:58 p.m. Wednesday: 50 degrees.

4:58 a.m. Thursday: minus 15 degrees.

The largest plunge came when temperatures dropped 47 degrees in just two hours Wednesday from 46 degrees at 3:58 p.m. to minus 1 degree at 5:58 p.m.

Snow blankets buildings in Buffalo, New York, on Wednesday, December 28.

National Guard troops check on Buffalo residents on December 28.

A traveler searches for luggage December 28 at a Southwest Airlines baggage holding area in Denver International Airport. More than 90% of Wednesday's US flight cancellations were Southwest flights, according to flight tracking website FlightAware. Southwest canceled more than 2,500 flights.

People help push a car out of snow in Buffalo on Tuesday, December 27.

Niagara Falls in New York is partially frozen on December 27.

Travelers at Baltimore/Washington International Airport deal with the impact of canceled flights on December 27.

A gas station canopy lays on its side after high winds and heavy snow in Lackawanna, New York, on December 27. The historic winter storm dumped up to 4 feet of snow on the area.

Hundreds of unclaimed suitcases sit near the Southwest Airlines baggage claim area in Tennessee's Nashville International Airport after the airline canceled thousands of flights on December 27.

A street is blanketed by snow in downtown Buffalo on Monday, December 26.

A person clears a snow-covered driveway in Buffalo on December 26.

A man and a boy walk across the frozen Reflecting Pool towards the Lincoln Memorial in Washington, DC, on December 26.

Firefighters carry rescue equipment as they respond to a fire on a snow-covered street in Buffalo on Sunday, December 25.

Snow blankets a neighborhood in Cheektowaga, New York, on Christmas Day. Western New York is drowning in thick "lake effect" snow -- which forms when cold air moves over the warm waters of the Great Lakes -- just one month after the region was slammed with a historic snowstorm.

A man tries to dig out his car after he got stuck in a snowdrift about a block from home in Buffalo on Saturday, December 24.

Icicles created by a sprinkler hang from an orange tree in Clermont, Florida, on December 24.

A young holiday traveler passes the time at Detroit Wayne County Metro Airport on December 24.

Pedestrians deal with the cold in Chicago on December 24.

Hoak's Restaurant in Hamburg, New York, is seen covered in ice from the spray of Lake Erie on December 24.

Nissan Stadium employees clear the field in Nashville before the an NFL football game on December 24.

Amanda Kelly cleans off snow and ice from her car in Columbus, Ohio, on Friday, December 23.

Cars drive in whiteout conditions in Orchard Park, New York, on December 23.

Travelers sleep while lines of people pass through a security checkpoint at Denver International Airport.

Snow-covered buildings are seen in Louisville, Kentucky.

The waters of Lake Erie wash over the shoreline in Hamburg, New York, on December 23.

Snow collects on a bison at the Longfield Farm in Goshen, Kentucky, on December 23.

Volunteers welcome a homeless person to a shelter at Louisville's Broadbent Arena on December 23.

Stones are removed from a road in Westport, Massachusetts, after a storm surge made landfall, flooding many coastal areas on December 23.

The Louisville skyline is obscured by steam rising from the Ohio River on December 23.

Antonio Smothers jump-starts his vehicle in Nashville on December 23.

Rows of headstones at the North Dakota Veterans Cemetery are blanketed by drifting snow in Mandan on Thursday, December 22.

Migrants warm themselves by a fire next to the US-Mexico border fence on December 22 in El Paso, Texas.

Robert Arnold puts chains onto the tires of his semitrailer while he waits for the eastbound lane of I-70 to reopen in Silverthorne, Colorado, on December 22.

A musician departs following a show on Broadway in Nashville on December 22.

Brady Myers helps turn the Stewpot Community Services day shelter for the unhoused into an emergency overnight shelter in Jackson, Mississippi, on December 22.

Vehicles travel along Interstate 44 on December 22, in St. Louis.

A person walks through the snow on December 22 in downtown Minneapolis.

A clean car passes a snow-covered car in Des Moines, Iowa.

Travelers walk in front of flight information screens at O'Hare International Airport in Chicago on December 22.

Ice collects on a window in Oklahoma City on December 22.

Bus riders wait at a sheltered stop in Chicago on December 22.

An accident involving a semi-tractor-trailer blocks the eastbound lanes of Interstate 80 in West Des Moines on December 22.

Kids shovel snow off a sidewalk and driveway in Minneapolis on December 22.

Travelers arrive for their flights at O'Hare International Airport on December 22 in Chicago.

Mist rises above ice flows on the Yellowstone River on December 22 in Paradise Valley, Montana.

Students walk to school buses after early dismissal at a middle school in Wheeling, Illinois, on December 22.

Miguel Salazar clears sidewalks in Denver on December 22.

Travelers arrive at the Minneapolis-Saint Paul International Airport on December 21.

Salt is prepared to be loaded onto a truck at the Department of Public Works sanitation yard in Milwaukee on December 21.

Propane heaters sit next to pens at the City of Mission Animal Shelter in Mission, Texas, on December 21.

Crews de-ice a Southwest Airlines plane before takeoff in Omaha, Nebraska, on December 21.

An Iowa Department of Transportation plow clears a road in Iowa City on December 21.

Snow covers homes in Seattle on December 20.

In pictures: Winter storm impacts the US

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Amarillo, Texas

(Central time)

Dropped 42 degrees in six hours.

11:53 p.m. Wednesday: 41 degrees.

5:53 a.m. Thursday: minus 1 degree.

The current wind chill this morning is minus 7 degrees.

Wichita, Kansas

(Central time)

Dropped 36 degrees in nine hours.

9:53 p.m. Wednesday: 34 degrees.

6:53 a.m. Thursday: minus 2 degrees.

However the temperature dropped 20 degrees from 32 to 12 in just one hour between 11:53 p.m. and 12:53 a.m. Wednesday night.

Temperatures are still falling and are expected to bottom out near minus 4 later Thursday morning.

Lines of cots for people seeking refuge from the intense cold front sweeping over the intermountain West fill the walkways in the Denver Coliseum Wednesday, December 21, 2022.

Kansas City, Missouri

(Central time)

Dropped 30 degrees in 6 hours.

11:54 p.m. (Wednesday): 32 degrees.

5:54 a.m. (Thursday): 2 degrees.

And temperatures are forecast to continue falling this morning, bottoming out near minus 7 by midday.

Oklahoma City

(Central time)

Dropped 34 degrees in 14 hours.

4:52 p.m. (Wednesday): 42 degrees.

6:52 a.m. (Thursday): 8 degrees.

The biggest plunge was 23 degrees in just 2 hours early this morning when temperatures dropped from 37 at 2:52 a.m. to 14 degrees at 4:52 a.m.

Temperatures are expected to bottom out near 4 degrees later Thursday morning.