A "potentially historic spring blizzard" will hit this week, according to the National Weather Service office in Aberdeen, S.D.
National Weather Service
The winter storm has been linked to at least one death, after a Colorado patrolman was struck by a driver who lost control of his car.
By Saturday, the National Weather Service says, the central Plains area will see temperatures in the low 60s — nearly 20-25 degrees above normal.
The National Weather Service warned of a "very dangerous" cold air mass, prompting governors to declare emergencies and school districts to shut down.
The arctic air will stretch from Illinois west through the Dakotas until Thursday.
The storm is bringing snow, ice, freezing rain and arctic air to much of the East Coast.
Despite the shutdown, the National Weather Service is putting out forecasts and helping local officials prepare for dangerous weather, even as employees worry about making ends meet at home.
The Port Orchard twister was extremely rare, especially for December, says the National Weather Service. No serious injuries were reported, but homes and other buildings were affected by the storm.
The National Weather Service warns of "potentially life-threatening conditions" from strong rip currents and powerful waves.