police say kelley williamson and randy yarnell blew three a stop sign slamming into corbin jaeger as the three men pursued a storm. this was their live need shortly before the crash. >> they did something they absolutely love and people should strive every day to do something they love. that's what kelley and randy did. >> reporter: williamson and yarnall were veterans. >> go to the right a bit and back to the left. >> reporter: contractors for the weather channel owned in part by nbc universal, contributors to the show "storm wranglers" where the men spoke of the dangers they face. >> people can sit at home where it's safe and we're out there getting the shot for them. >> reporter: in pursuit of treacherous weather, the most dangerous part of their job is driving to the storm. >> go, go, go, randy! >> reporter: but their research on tornado formation done from the field. >> hang on! >> reporter: is often used by meteorologists to warn the public of potential threats. >> do not ride this out in your home. >> it's a big one. >> reporter: but tonight the national weather service calls

police say the two blew through a stop sign slamming into corbin jaeger as the three pursued a storm.was their live feed shortly before the crash. williamson and yarnall were veterans. >> go back to the left. >> reporter: contractors for the weather channel owned in part by nbc universal, contributors to the show "storm wranglers" where the men spoke of the dangers they face. >> people can sit at home where it's safe and we're out there getting the shot for them. >> reporter: in pursuit of treacherous weather stormchasers say the most dangerous part is driving to the storm. >> go, go. >> reporter: but their research on tornado formation done from the field -- >> hang on. >> reporter: -- is often used by meteorologists to warn the public of potential threats. >> do not ride this out in your home. >> it's a big one. >> reporter: the national weather service calls the practice dangerous. a risky job that can save lives and take them. miguel almaguer, nbc news. >> certainly thinking of them with the severe weather and tornado season, and also other storm chasers out risking their lives. >

the third storm chaser was corbin lee jaeger. police say one of the vehicles ran a stop here. back here, texas and oklahoma not out of danger yet. more storms expected this afternoon. matt and savannah. >> tammy, thank you very much. >> lots to talk about with al who has his eyes on severe weather with his latest stop at the roker thon tour at the university of tennessee. good morning. >> good morning, guys. our thoughts and prayers are with the storm chaser's families, a terrible tragedy. unfortunatel weather today. already on the radar things very active, strong storms firing up from kansas down into texas and into the panhandle as well as this slow-moving system, this upper-level low pushes east. so far today, we've got 20 million people at risk for damaging winds, hail, and the best chance of tornados, missouri and arkansas. tomorrow, it's even worse. the risk the stronger tomorrow. 30 million people at risk with a strong risk from nashville, tupelo, memphis, all the way down into central mississippi. we're looking at strong storms, tornadoes from kentucky into mississippi