A massive tornado intercepted by a storm chaser in South Dakota was seen twisting and transforming right before him.

A tornado watch is issued by the Storm Prediction Center for counties where tornadoes may occur, and the watch area is typically large, covering numerous counties or states.

A tornado watch is the perfect time to prepare for bad weather, and get organized. Tornadoes can happen any time of the year, but they typically occur in the spring and summer, ...

Tornado watches and warning are issued by the National Weather Service. A tornado watch can be issued hours before a severe storm arrives and is intended to let residents know about the potential ...

4:18 p.m. CDT - A tornado watch remains in effect across portions of northern Ontario as a line of severe thunderstorms moves ...

A tornado watch means "be prepared." Tornadoes are possible in and near the watch area. Review and discuss your emergency plans and check supplies and your safe room.

3:21 p.m. EDT - A tornado watch is in effect across portions of northern Ontario amid a severe storm threat on Saturday ...

The National Weather Service released an updated tornado warning at 5:02 p.m. on Tuesday in effect until 5:15 p.m. for Berks ...

Take cover, a tornado watch was issued by the National Weather Service in Norman on Tuesday, June 17, from 3:40 p.m. until 10 p.m. This warning applies to Alfalfa, Blaine, Custer, Dewey, Ellis, ...

Tornado watch south of Chicago As of 12:15 p.m. today, a tornado watch was in effect until 7 p.m. in Livingston, Grundy Will, Kankakee, Ford and Iroquois counties.