Forecasters on Monday warned millions of Americans to be prepared for another round of severe storms, including strong tornadoes, a day after storms killed 16 people in three states.
The storms Sunday in Oklahoma, Iowa and in Arkansas - where 14 of the 16 people died - were the opening act of a three-day weather spell expected to provide at least a slight risk of severe weather through Wednesday.
In the hardest-hit area, Faulkner County, Arkansas, Sunday's suspected tornado shattered homes, tossed tractor-trailers and killed 10 people, two of them children, authorities said. The most affected areas were in the towns of Vilonia and Mayflower.
"There were cars flipped everywhere, there were people screaming," James Bryant, a Mississippi State University meteorology student, told CNN's "New Day" on Monday. "It was a tough scene."
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Anguished relatives of missing South Korean ferry passengers waited sullenly for answers Thursday as rescuers fought bad weather, murky water, darkness and time to find a way deep into the capsized ship.
Authorities believe 287 people - many of them high school students on a field trip - remain trapped inside the five-story ship. At least some, authorities say, could still be alive more than a day after the ship rolled over.
Meanwhile, the ferry's captain is facing mounting questions about the incident.
If search teams are able to find debris confirmed to be from the plane, it will help officials figure out roughly where the aircraft went down.
Aviation journalist Jeff Wise explained some of the process on "New Day."
Officials would then be able to focus the search under the water to try to find larger pieces of wreckage and the all-important flight data recorder, which may hold vital clues about what happened on board the night the plane disappeared.
U.S. hardware designed to help with that task arrived Wednesday in Perth, the western Australian city that is the base for the search efforts.
The United States sent a Bluefin-21 autonomous underwater vehicle, which can search for submerged objects at depths as low as 14,700 feet (about 4,500 meters), and a TPL-25, a giant listening device that can help pinpoint the location of pings from the flight data recorder. Towed behind a ship, the TPL-25 can detect pings at a maximum depth of 20,000 feet (about 6,100 meters).
Time is against that part of the search though as the plane's pinger is expected to run out of power within the next two weeks. The Indian Ocean has an average depth of about 13,000 feet (about 4,000 meters).
Tuesday's search for Flight 370 was called off on account of weather, Australian officials said.
Gale-force winds, large waves, heavy rain and low clouds were lashing the search area, making it impossible to dispatch surveillance planes to the scene and making it all but impossible to spot anything from ships.
The search is expected to resume Wednesday with 12 aircraft. Four Chinese vessels are also expected to join the search. And equipment to locate the plane's locator beacon is expected to arrive Wednesday from the United States.
But even with more searchers and equipment and calmer weather, the effort will still face severe challenges.
The area is extraordinarily remote - some 1,500 miles from Perth, Australia, where military surveillance planes capable of searching the site are being based. It is also astoundingly large - some 400,000 to 500,000 square miles of ocean.
"With eight hours of flying to and from the search region, the fleet of P-3 Orion aircraft and other military aircraft have only a precious few hours to scour the search tracks they have been given," Australian Defence Minister David Johnston said.
CNN's Kate Bolduan spoke with Johnston on "New Day" Tuesday.
The official said his first priority is confirming the debris is from the missing plane.
"The first thing we want to do is extract some wreckage, if there is any, from the surface of the ocean down there...and identify it as being part of the aircraft."