<human>:  What is the difference between a tornado watch and warning?
<bot>: A Tornado Watch is an alert from the National Weather Service (NWS) that indicates that conditions are favorable for a tornado to form. This means that you should remain alert, watch the sky, and stay tuned to local radio and TV stations for more information. A Tornado Warning means that a tornado has been spotted or is indicated on radar, and you should take immediate action to seek shelter.