the ground for just four minutes before shredding its way through the buildings and killing two people. >> it's a very trying time for us, and we're going to get through it. >> reporter: but the worst may be yet to come. kn severe flooding is threatening 10 million americans in the central states from west texas to illinois. oklahoma's governor has signed an executive order declaring a state of emergency in all counties. >> we're not out of the woods yet. we're still monitoring the inflows coming into the watershed and into the keystone reservoir. so it still could get worse. >> reporter: the tulsa county sheriff's office captured these images showing the extent of the flooding in this west tulsa neighborhood and the difficulty facing first responders. the arkansas river here is expected to exceed record flooding levels in the coming days. the threat is forcing the army corps of engineers to accelerate the release of water to take the pressure off its levees. sunday's extreme weather comes