The National Weather Service in Des Moines has confirmed a tornado touched down in parts of Lidderdale, Lake City, Rockwell City, and adjacent areas yesterday. The estimated peak wind with the storm maxed out at 100 MPH, which is of EF-1 on the enhanced fujita scale. The tornado was on the ground for 20 miles or so with a max path width of 1/4th a mile, or 440 yard. There were no injuries or fatalities.

In the report, the NWS noted that the tornado began at 7:13 p.m. 2.2 miles north-northwest of Lidderdale, continued for 44 minutes, and at 7:57 p.m., ended 2 miles north of Rockwell City.

Here is the NWS report on the tornado:

Overview: Storms formed in the evening hours of Sunday, May 10th 2015 along a cold front associated with an area of low pressure across South Dakota. The front was stretching SSE across western Iowa by early evening. The tornado initially touched down in northern Carroll County northwest of Lidderdale and moved northeast impacting Lake City and the western edge of Rockwell City before lifting just north of town. One EF-1 long-track tornado occurred with this event. An additional brief touchdown also likely occurred southwest of Manson based on spotter reports, but no damage was found. A few other storms became severe across western and central Iowa with an 80 mph wind gust reported at the Carroll Airport and some wind damage reported with this storm near Lidderdale. This storm moved north and produced baseball size hail near Lake City shortly after the tornadic storm had moved through the town. A machine shed was destroyed by straight-line winds in northern Audubon County and also power lines and poles were downed just south of Van Meter in Dallas County.

Tornado 1 – Lake City/Rockwell City: The tornado touched down northwest of Lidderdale and tracked northeast, striking the west side
of Lake City. The tornado continued passing through rural Calhoun County and hit some power poles on the west side of Rockwell City before lifting about 2 miles north of Rockwell City in rural Calhoun County. Much of the damage included leaning power poles, tree damage and uprooted trees. In the town of Lake City, the roof was removed from the High School, a doublewide manufactured home and north of town the roof was removed from a warehouse building. The track of this tornado will continue to be evaluated in the coming days as additional photos and videos are reviewed.