What Is SKYWARN? SKYWARN® is a volunteer storm spotter program coordinated by the National Weather Service (NWS). Trained volunteers across the United States watch for severe weather and report real-time observations, such as hail size, wind damage, flooding, and tornado sightings, back to the NWS and local public safety officials. These “ground truth” reports help forecasters confirm radar data and issue more accurate and timely warnings that save lives and property. How SK