The National Weather Service is investigating a series of tornado that struck the state of Iowa last night. However, the National Weather Service says many of the twisters were minor and only on the ground from one to two minutes, even thought there was a total of 15 tornado warnings across the state. Anywhere between ten and 20 tornadoes touched down. Two caused damage near Iowa Falls and Montezuma. Someone was hurt near Barnes City in Poweshiek County near central Iowa. There were also reports