In 2013, a deadly tornado devastated Moore, a suburb just south of Oklahoma City, destroying a school and killing several students inside. That tornado carved a destructive path in the region for 27km and killed 24 people, including 10 children.
The timing of the warning was particularly ominous for residents of Moore: Today was the six-year anniversary of the tornado that struck the town.
Several school districts in Oklahoma, including in the Oklahoma City and Tulsa regions, cancelled classes. Other residents and agencies were taking their own precautions. Tinker Air Force Base, near Oklahoma City, evacuated some aircraft.
The National Weather Service posted an update on Twitter showing that a storm near the small town of Crescent, about 55km north of Oklahoma City, had produced at least two brief tornadoes. Forecasters warned that "the threat for more tornadoes remains high with this storm." Local television crews captured images of two twin tornadoes in the largely rural area.
The office of the Oklahoma governor, Kevin Stitt, said in a statement that the state's emergency operations centre had been activated and that an advance team from the Federal Emergency Management Agency had been brought in to "help facilitate the delivery of any federal resources that may be needed."
In a brief video posted on Twitter, a National Weather Service forecaster said to expect "multiple waves of severe thunderstorms," adding, "Do not let your guard down. It looks like severe storms and flooding will still be a big problem overnight."
Written by: Manny Fernandez
Photograph by: William Widmer
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