An April blizzard, severe storms and wild temperature swings were all caused by a dynamic storm in the Plains.
While dynamic storms are typical in the spring as warmth returns across the South and cold air lingers across the north, this storm was quite unusual.
Blizzard conditions evolved on Tuesday from Colorado and Wyoming to Nebraska and South Dakota.
Winds over 50 mph created snow drifts as high as 9 feet, while portions of I-25 and I-80 were shut down.
Rapid City Airport, S.D., recorded its snowiest single day of all time on Tuesday with a total of 20.0 inches.
There was a total of 44 record daily snowfall amounts set in the U.S. on Tuesday, according to the National Climatic Data Center (NCDC).
This NCDC map shows the location of where record snow amounts were set on Tuesday, April 9, 2013.
On Tuesday, temperature differences across the Plains were more than 90 degrees. Highs ranged from 12 degrees in Cheyenne, Wyo., to 108 degrees in Laredo, Texas.
The violent clash of air masses helped to set up the battlegrounds for severe storms from Texas to Iowa. The strongest storms produced hail up to 2.00 inches in diameter and wind gusts higher than 65 mph.
Farther south, temperatures soared then crashed across portions of Oklahoma and Texas. The colder air arrived as winds switched out of the north.
"It's really unusual to have this magnitude of arctic air drive this far south in the Plains this time of year. It's a sign of how amplified the weather pattern is in the U.S.," AccuWeather Expert Senior Meteorologist Alex Sosnowski said.
While the high reached 79 degrees in Oklahoma City, temperatures dropped into the lower 30s overnight. Heavy thunderstorms this morning changed over to freezing rain with thunder.
"There may be a similar storm next week, but without the same magnitude of arctic air," Sosnowski said.
At least 18 people have died in West Virginia as a result of extreme flooding that inundated portions of the state on Thursday.
On the heels of Danielle, another weak tropical system will move onshore from the Gulf of Mexico with drenching downpours and the risk of flash flooding.
The risk of thunderstorms and severe weather will return to the north-central United States this weekend, including some areas that were hit by violent storms on Wednesday.
Portions of North and South Carolina will face the threat for heavy thunderstorms that could turn severe into Friday evening.
Showers threaten to cause delays on a nearly daily basis next week at the 2016 Wimbledon Championships.
After dealing with heavy thunderstorms and heat to start the weekend, Germany will welcome more seasonable temperatures and fewer downpours early next week.
New York, NY (1975)
A Boeing 727 crashed on a landing approach to JFK. Believed to be caused by a "microburst" from a thunderstorm, the crash killed 112, and injured 12 others.
Unseasonably chilly. High temperatures: Buffalo, NY 60 Jamestown, NY 53 Erie, PA 57 Dubois, PA 55 Pittsburgh, PA 63 Youngstown, OH 56
Scranton, ND (1991)
3.50" of rain in 28 minutes along with 1.5 foot drifts of marble-sized hail. Front end loaders were needed to clear the streets.