A new Severe Thunderstorm Watch has been issued until 3am for the following counties, Buena Vista, Cherokee, Ida, Plymouth, Sioux, Woodburym Harrison, Monona, Pottawattamie and Shelby. This replaces the watch that was scheduled to expire at 10pm. The squall line continues moving to the SSE around 25-30mph. The storms have tended to be weaker over the last 30 minutes, but may still produce large hail and especially damaging winds.