A Tornado Watch is an alert issued by the National Weather Service when conditions are favorable for the development of tornadoes in a specific area. It means that people should stay informed and be prepared, as tornadoes could form. This watch can cover large regions and may last for several hours. During a Tornado Watch, it is important to monitor local weather updates and have a safety plan in place. If a tornado warning is issued later, it indicates that a tornado has been sighted or indicated by radar, requiring immediate action to seek shelter.