EF2 tornado in Bremer County, Iowa

The tornado moved into Bremer county from Butler county. The tornado impacted a couple of acreages just east of the county line producing EF0 and EF1 damage before weakening and becoming an intermittent funnel. The tornado destroyed 2 barns just north of the 4th street SW exit off of Highway 218. It then crossed the Cedar River just southwest Waverly doing damage to houses on both sides of the river, mostly EF0 and EF1 damage. After crossing Hilton Avenue, it intensified and produced EF2 damage with extensive tree damage along with toppling a high voltage power line. The tornado continued farther east and slowly weakened, staying mostly in open rural land. The tornado eventually lifted to the northwest of Denver.

A surface low pressure system was centered over Kansas and Nebraska with attendant warm front draped across north central Iowa. This was bisected by an outflow boundary from morning convection across western Iowa. As morning activity exited the are the atmosphere quickly recovered steep low and mid level lapse rates exceeded 8 C/km with 0-6 km shear over 40 knots. Near the remnant outflow boundary 0-1 km SRH exceeded 150 m2/s2. Storms developed along this boundary and moved east along the warm front, spawning a number of tornadoes across the state. In fact, this is in the top 5 for tornadoes occurring in a single day for the state of Iowa since reliable records began in the 1980s. By evening convection congealed into an MCS, bringing heavy rain to portions of the state. A line of training storms set up north of the Des Moines metro, resulting in localized flash flooding.