"We have reports of cars overturned," said ABC News' Mike Boettcher, who was monitoring police reports from his home in Oklahoma City. "People are now going out trying to find out how severe the damage is. The problem is it's widespread."
The latest storms hit less than two weeks after a massive E-5 tornado jolted Moore, Okla., on May 20, killing 24 people, smashing hospitals and schools, and flattening neighborhoods.
Moore City Manager Steve Eddy, driving around Moore after the latest storm, told ABC News this evening he saw minor flooding and power outages, but he did not immediately see evidence of tornado activity.
Oklahoma City Police Emergency Management said it was in the early stages of assessing damage. Emergency responders were helping motorists stranded by widespread flooding, but the agency said there was no confirmed touchdown of a tornado in the city.
Police in Norman, Okla., said there had been no tornados in that city.
ABC News' Dan Childs, Erin Koehane, Michael Kreisel and Wendy Fisher contributed to this report.