"The snow around Boulder will probably end sometime during the evening, but temperatures will be cold enough that there is definitely some threat for icy roads Thursday morning before it warms up enough to melt off the ice".
The result, the office says, adds up to a "potentially historic spring blizzard".
Typically we see "bomb cyclones" form off the US East Coast in the form of nor'easters.
According to the AP, a storm system is moving in from the Pacific Ocean and is forecast to intensify and form into a new inland "bomb cyclone". Some isolated areas of South Dakota, Nebraska, Minnesota and Wisconsin could see as many as 20 inches.
Blizzard warnings have been issued for the northern half of Colorado's heavily-populated Front Range region, including Denver, as well as the state's northeastern plains from noon through midday Thursday. A winter storm warning has also been issued for Jefferson, Broomfield and Boulder counties. Forecasters in New Mexico said the winds also would make travel hard on north-south oriented roads such as Interstate 25. April 10, however, the city is under a blizzard warning with readings set to plunge to 21, the weather service said. However, by the afternoon hours on April 10, snow showers are expected, with accumulations up to several inches in some areas. "Really think about whether you need to travel", the South Dakota public safety tweeted Wednesday.
A major storm lies ahead which is expected to target Central United States.
"We usually get a winter storm sometime in April", the National Weather Service's Kari Fleegel told South Dakota Public Broadcasting 's Gary Ellenbolt.
And to top things off, wind gusts are expected to be as high as 45 miles per hour.
The coming storm was expected to exacerbate flooding along the Missouri River in areas where dozens of levees were breached in March, exposing communities to future surges.
To the south of storm number one, the weather will be a mixture of rain, snow, and sleet, he says.
"An Extreme Risk of fire danger is in place in the Storm Prediction Center's Fire Weather Outlook for the Southern High Plains".
In addition to snow, residents could see risky flooding, including in towns in Nebraska, Iowa, Minnesota and along the Missouri River, where people are still coping with the effects of last month's floods. And after temperatures hit the mid-60s to mid-70s this past weekend, the drastic change will leave millions of Americans wishing spring weather would hurry up and stay.