Chris Machian / AP
An overturned semitrailer rests on its side on the eastbound lanes of Interstate 40, just east of El Reno, Okla., after a reported tornado touched down, Friday, May 31, 2013.
Click to view scenes from Friday's violent storm.
NBC's Janet Shamlian reports from Oklahoma City, Okla., where the main tornado system passed through. Now, a second rotational system is on the way, threatening Moore, Okla.
Oklahoma resident Garrett Occhipinti speaks with MSNBC via phone about a photo he took of the storm that showed massive wall clouds stretching for over a mile.
Cody Duty / Houston Chronicle via AP
A firefighter is wheeled to an ambulance after fighting a fire at the Southwest Inn on Friday, in Houston.
Flags were flying at half-staff Saturday in Houston as the city mourned the loss of four firefighters who were killed trying to save the community. Diana Alvear reports.
The Plain Dealer /Landov
Cleveland police arrest a woman involved with a fight that broke out at Michael R. White Elementary school after a kindergarten graduation ceremony on Friday in Cleveland.
Zumba dance instructor Alexis Wright pleaded guilty to 20 counts of prostitution in a case that rocked the small seaside town of Maine.
Alexis Wright, the fitness instructor who pleaded guilty to running a prostitution ring out of her Zumba studio, addressed the judge at her sentencing hearing in Maine.
Robert F. Bukaty / AP File
Alexis Wright, 30, leaves the Cumberland County Courthouse on March 13, 2013, in Portland, Maine.
Patrick Smith / Getty Images file
The Navy-Marines Memorial Stadium in Annapolis, Md, is pictured in 2012.
As Arizona mom of seven Yanira Maldonado's court hearing on drug smuggling charges begins in Nogales, Mexico, she is speaking out for the first time, saying her "spirit is good," but she just wants "to go home." NBC's Miguel Almaguer reports.
Yanira Maldonado, who was charged with smuggling drugs in Mexico, is reuniting with her family after a week in jail. She was released shortly before midnight. NBC's Miguel Almaguer reports.
Dan Koeck / for NBC News
Aaron Butler said that after he told his 8-year-old son Evan that they were leaving the Scouts, "he sat on my lap and cried for 10 minutes."
Kevin Lamarque / Reuters
Spellers ranging in age from 8 to 14 descended on National Harbor, Md., for the annual contest.
Arvind Mahankali won the 86th National Spelling Bee Thursday night by spelling the word "knaidel." He chats with the TODAY anchors about his big win.
Scott Shaw / The Plain Dealer / Landov
Charles Ramsey talks to media as people congratulate him on helping some women get out of a home in the 2200 block of Seymour Ave on May 6, 2013. Amanda Berry, Gina DeJesus and others were rescued from the house.
In July 2011, Jacque Sue Waller's sister, Cheryl Brenneke, told TODAY's Amy Robach about the search for her sister.
Authorities in Mexico seized more than a ton of cocaine that was hidden inside frozen sharks. Dara Brown reports.
Texas border agents find more than 30 pounds of marijuana hidden inside several large paintings of Jesus. NBC's Dan Scheneman reports.
U.S. Customs and Border Protection
Drug smugglers carve out secret compartments in border-crossing vehicles, like this one that hid 266 pounds of marijuana when it was seized in El Paso earlier this month, officials said.
U.S. Customs and Border Protecti
U.S. Customs and Border Protection Office of Field Operations officers working at the El Paso port of entry seized 591 pounds of marijuana on May 1. The drugs were hidden within plaster figurines, columns, and other items imported from Mexico. The estimated street value of the seized contraband is $473,000.
A picture taken from a KFOR helicopter, which was heading to Logan County, Okla., where a possible tornado was forming. Logan County is about 20 miles north of Oklahoma City.
High winds and heavy rains toppled trees and ripped the roofs off of some buildings in New York Mills, N.Y. WKTV's Nicole Pitt reports.
Thursday brought several tornadoes, most centered in Oklahoma and Arkansas. Tornadoes are likely in many states on Friday as well, with rain in the forecast through Monday in Oklahoma and surrounding states. The Weather Channel's Mike Bettes reports.
Tom Pennington / Getty Images
A monster tornado hit Moore, Okla., Monday afternoon, leaving at least 24 dead.
Darla Buck / Moore, Okla., public schools
Stuffed animals and crosses are seen at a makeshift memorial at the site of the Plaza Towers elementary school. Inside the rubble, debris removal workers found signs that read "believe," "love," and "dream," and stuck those by the memorial instead of throwing them out.
Demolition begins on the destroyed Plaza Towers elementary school on Thursday, in Moore, Okla.
For the first time since Monday's devastating tornado, teachers, students, and parents at Plaza Towers Elementary School in Moore, Okla. gathered together Thursday afternoon. Said one teacher, "I know I'm probably still in shock." NBC's Kate Snow reports.
Timothy Clary / AFP - Getty Images
New York City Mayor Michael R. Bloomberg arrives for a speech in Manhattan on Thursday.
Rich Pedroncelli / AP file
Teacher Cecilia Richardson helps a student tie a ribbon honoring murder victim, third grader Leila Fowler, at Jenny Lind Elementary School in Valley Springs, Calif., Monday April 29, 2013.
Conditions are favorable for the development of tornados in Kansas, Oklahoma and surrounding states. Isolated tornadoes are also possible in the Northeast. The Weather Channel's Chris Warren reports.
Alex Wong / Getty Images file
Former U.S. Deputy Attorney General James Comey testifies during a hearing before the House Commercial and Administrative Law Subcommittee of the Judiciary Committee May 3, 2007 on Capitol Hill in Washington, DC.
Rachel Maddow describes the hospital bedside drama in which James Comey, reported to be President Barack Obama's pick to head the FBI, thwarted the Bush administration's domestic spying plans.
Spc. Ryan Hallock / DVIDS via AP, file
Staff Sgt. Robert Bales
Anja Niedringhaus / AP, file
Mohammed Wazir sits with his only surviving son, Habib Shahin, 3, in Kandahar, Afghanistan. 11 members of his family were killed.
Women are going online to show their compassion for the wife of the Army staff sergeant who has been charged with 17 counts of murder. NBC's Miguel Almaguer reports.
Erin Siegal / Redux
A car with bricks of marijuana concealed in its bumper is seized by U.S. Customs and Border Patrol agents work along the U.S.- Mexico border crossing joining Tijuana, Baja California, Mexico, to San Diego, California.
John Moore / Getty Images
A U.S. Office of Air and Marine agent stands over a drug smuggler on the bank of the Rio Grande River at the U.S.-Mexico Border on April 11, 2013 in Mission, Texas. Agents with helicopter support from the U.S. Office of Air and Marine broke up a marijuana smuggling operation from Mexico into Texas.
Seven people, including four children, died in a crash involving a tractor-trailer in upstate New York. NBCNews.com's Dara Brown reports.