A tornado hit a small Oklahoma town on Monday, knocking out power to the community of 1,000 residents and damaging a farm just two weeks after a tornado elsewhere in the state killed at least six people, the National Weather Service said. No injuries were immediately reported in Monday night’s twister in Medford, but much of northern Oklahoma was placed under tornado watch through the night, and flash flood warnings were issued due to heavy rains the past two days, said Forrest Mitchell of the National Weather Service in Norman, Oklahoma.