It was the afternoon of Thursday, May 12th, and much of eastern South Dakota braced for an evening of rough and dangerous weather. It was the kind of weather that makes the hair on the back of your neck stand up. Before long, social media feeds quickly filled with images of massive storm heads or “cloud walls” that looked as ominous as they sounded. We later learned from the National Weather Service (NWS) that the so-called “cloud wall” had a name: derecho. South Dakotans along the I-29 corridor will not soon forget it, either. Before long, the day’s cautions lead to warnings and storm sirens that bellowed across the town of Castlewood, South Dakota.
EF2 tornado in Castlewood