Three storm-chasers following a tornado's path were killed when their cars collided in Texas.
The accident happened on Tuesday when the men drove through a crossroads as they were all reportedly chasing a storm.
Kelley Williamson, 57, Randall Yarnall, 55, and Corbin Lee Jaeger, 25, all died instantly when their two vehicles collided, local police say.
There was a heavy rain forecast at the time and a tornado warning was in place, but it's not clear if the weather was a factor in the crash.
All three men had been chasing the tornadoes. Mr Williamson and Mr Yarnall were Weather Channel contractors, and had their own show called Storm Chasers.
"Kelley and Randy were beloved members of the weather community," the Weather Channel said in a statement.
"We are saddened by this loss and our deepest sympathies go out to the families and loved ones of all involved."
A friend of the men told CNN Mr Williamson was "fearless".
"He was a professional bullfighter before he was a storm chaser," Cary Meltzer said.
"You got to be a little fearless to do that."
Also on Tuesday in Oklahoma, high winds pushed a truck off a highway, killing its driver.
There were gusts of up to 152km/h near Oklahoma City, where the crash happened, meteorologists said.
The storms also brought tennis ball-sized hail, but no widespread damage in Texas or Oklahoma has been reported yet.
The severe weather is forecast to head eastward on Thursday, threatening millions in Arkansas, Mississippi, Kentucky, Texas and Louisiana.