A Severe Thunderstorm Watch has been issued for Audubon, Black Hawk, Boone, Calhoun, Carroll, Dallas, Greene, Grundy, Guthrie, Hamilton, Hardin, Jasper, Marshall, Polk, Poweshiek, Sac, Story, Tama, and Webster Counties until 9:00 PM Friday.
Primary Threats Include:
- Scattered large hail likely with isolated very large hail events to 2 inches in diameter possible
- Isolated damaging wind gusts to 60 MPH possible
Scattered thunderstorms are expected to develop and spread across the watch areas this afternoon and early evening. These storms will track atop a cold/stable surface layer, with large hail being the primary threat.