difference between tornado warning & watch
A Tornado Warning is issued when a tornado is imminent. When a tornado warning is issued, seek safe shelter immediately. Tropical Storm Watch. A Tropical Storm Watch is issued when a tropical cyclone containing winds of 34 to 63 kt (39 to 73 mph) or higher poses a possible threat, generally within 48 hours.
Tornado Watch. A tornado watch means that conditions are favorable for the development of tornadoes within the next couple of hours. Tornado watches are often issued an hour or two before severe weather begins, and they stay in effect for about six hours or until the thunderstorms pass through.