The National Weather Service (NWS), a branch of NOAA, issues weather alerts through 122 local Weather Forecast Offices and national centers like the Storm Prediction Center and National Hurricane Center. This article defines the precise criteria for its watches, warnings, and advisories, which are grouped into categories such as severe local storms, winter weather, flooding, and tropical cyclones. To ensure clear communication, the NWS assigns specific color codes and SAME (Specific Area Message Encoding) codes for NOAA Weather Radio broadcasts, helping the public understand the severity of events like tornadoes and flash floods. These standardized definitions allow alerts to be tailored to specific county warning areas and forecast zones across the country. Ultimately, this comprehensive terminology system is vital for public safety and effective emergency response in the United States.