The Latest on severe weather impacting the central U.S. (all times local):

6:45 a.m.

A powerful spring snow storm sweeping across the Midwest has made travel hazardous across Minnesota, Nebraska and South Dakota.

Ice forms on a calf at a ranch outside of Kilgore, Neb., Wednesday, April 10, 2019. A bomb cyclone storm bringing heavy snow and strong winds to several Rockies and Plains states is making travel difficult in many areas and impossible in others. (Chris Machian/Omaha World-Herald via AP)
Ice forms on a calf at a ranch outside of Kilgore, Neb., Wednesday, April 10, 2019. A bomb cyclone storm bringing heavy snow and strong winds to several Rockies and Plains states is making travel difficult in many areas and impossible in others. (Chris Machian/Omaha World-Herald via AP)

As much as 18 inches of snow has fallen in parts of South Dakota, where Gov. Kristi Noem closed state offices in much of the state Thursday amid heavy snow and strong winds.

Whiteout conditions have been reported in western Nebraska, where the Department of Transportation reported several highway closures Thursday morning.

Schools in Minneapolis and St. Paul are among hundreds of closed schools in Minnesota, where as much as 2 feet (0.61 meters) of snow is expected in the southwest part of the state by Friday. The Minnesota State Patrol says it has responded to more 200 crashes statewide since Wednesday.

An unidentified man sleeps on his luggage in Denver International Airport Wednesday, April 10, 2019, in Denver. (AP Photo/David Zalubowski)
An unidentified man sleeps on his luggage in Denver International Airport Wednesday, April 10, 2019, in Denver. (AP Photo/David Zalubowski)

The blizzard is part of a storm system known as a “bomb cyclone” that’s slowly churning through the central U.S. for the second time in a month.

___

12 a.m.

This March 2019 photo provided by Henry Red Cloud, shows flooding on Cloud's Lakota Solar Enterprises property on the Pine Ridge Reservation in southern South Dakota. (Henry Red Cloud via AP)
This March 2019 photo provided by Henry Red Cloud, shows flooding on Cloud’s Lakota Solar Enterprises property on the Pine Ridge Reservation in southern South Dakota. (Henry Red Cloud via AP)

A storm system known as a “bomb cyclone” churned through the U.S. interior for the second time in a month, unleashing a blizzard that struck the Upper Midwest and creating hazardous fire conditions farther south.

The storm knocked out power Wednesday to thousands of homes and businesses in South Dakota, disrupted air and ground travel from Colorado to Minnesota and threatened to swell rivers in the Midwest that flooded after March’s drenching.

National Weather Service Forecaster David Roth said both storms are what is known as a “bomb cyclone,” a weather phenomenon that entails a rapid drop in air pressure and a storm strengthening explosively.

A Frontier Airlines representative talks with passengers as they wait to rebook their flights in Denver International Airport Wednesday, April 10, 2019, in Denver. (AP Photo/David Zalubowski)
A Frontier Airlines representative talks with passengers as they wait to rebook their flights in Denver International Airport Wednesday, April 10, 2019, in Denver. (AP Photo/David Zalubowski)

Forecasters said this week’s storm will swell rivers again, though likely not to the levels seen last month.

A truck travels east on Interstate 80 during a blizzard warning hitting southeast Wyoming and the Colorado Front Range on Wednesday, April 10, 2019, in Cheyenne. (Jacob Byk/The Wyoming Tribune Eagle via AP)
A truck travels east on Interstate 80 during a blizzard warning hitting southeast Wyoming and the Colorado Front Range on Wednesday, April 10, 2019, in Cheyenne. (Jacob Byk/The Wyoming Tribune Eagle via AP)
A dog is seen peeking over a chain link fence along Parsley Boulevard during a blizzard warning hitting southeast Wyoming and the Colorado Front Range on Wednesday, April 10, 2019, in Cheyenne, Wyo. (Jacob Byk/The Wyoming Tribune Eagle via AP)
A dog is seen peeking over a chain link fence along Parsley Boulevard during a blizzard warning hitting southeast Wyoming and the Colorado Front Range on Wednesday, April 10, 2019, in Cheyenne, Wyo. (Jacob Byk/The Wyoming Tribune Eagle via AP)
A pedestrian walks across Warren Avenue during a blizzard warning hitting southeast Wyoming and the Colorado Front Range on Wednesday, April 10, 2019, in Cheyenne, Wyo. (Jacob Byk/The Wyoming Tribune Eagle via AP)
A pedestrian walks across Warren Avenue during a blizzard warning hitting southeast Wyoming and the Colorado Front Range on Wednesday, April 10, 2019, in Cheyenne, Wyo. (Jacob Byk/The Wyoming Tribune Eagle via AP)
In this undated March 2019 photo provided by Henry Red Cloud, shows flooding on Cloud's Lakota Solar Enterprises property on the Pine Ridge Reservation in southern South Dakota. (Henry Red Cloud via AP)
In this undated March 2019 photo provided by Henry Red Cloud, shows flooding on Cloud’s Lakota Solar Enterprises property on the Pine Ridge Reservation in southern South Dakota. (Henry Red Cloud via AP)
A calf runs through an ice field on a ranch outside of Kilgore, Neb., Wednesday, April 10, 2019. A bomb cyclone storm bringing heavy snow and strong winds to several Rockies and Plains states is making travel difficult in many areas and impossible in others. (Chris Machian/Omaha World-Herald via AP)
A calf runs through an ice field on a ranch outside of Kilgore, Neb., Wednesday, April 10, 2019. A bomb cyclone storm bringing heavy snow and strong winds to several Rockies and Plains states is making travel difficult in many areas and impossible in others. (Chris Machian/Omaha World-Herald via AP)
An ice jam led to a bridge collapsing in Norman County, Minnesota on Tuesday morning. Flooding in the area also shut down several roads. (April 10)
An ice jam led to a bridge collapsing in Norman County, Minnesota on Tuesday morning. Flooding in the area also shut down several roads. (April 10)