Valid Time Event Code

The Valid Time Event Code (VTEC) is a code used primarily by the National Weather Service (NWS) in the United States to indicate the validity period of specific weather warnings, watches, or advisories. It is part of a system to communicate critical weather information effectively, especially during severe weather events. The VTEC consists of a specific format that includes the phenomenon type (e.g., tornado, flood), the area affected, and the start and end times of the event.