1.   Conversely, in other cases all the conditions thought to produce tornados were found in looming storms that fizzled out without ever producing a tornado.

2.   If someone reports a tornado or if weather radar indicates a thunderstorm is strong enough to produce a tornado, local National Weather Service meteorologists issue a tornado warning.

3.   La Nina could produce more tornadoes because it pushes the subtropical jet stream north, bringing warm and moist air with it.

4.   Scattered strong thunderstorms erupting within the area of rain may produce a few tornadoes, as a jet stream disturbance passes overhead.

5.   Shifting winds with height will create enough twist in the atmosphere to produce isolated tornadoes, especially near Iowa.

6.   Some severe thunderstorms produce tornadoes, which are violently rotating columns of air that come in contact with land.

7.   Supercell thunderstorms capable of producing isolated tornadoes are possible from Nebraska to Illinois, though high wind gusts and hail will be the primary threat.

8.   Supercells can produce several tornadoes and are the main generator of the most powerful and long-lasting ones.

9.   Squally thunderstorms in the outer bands of Beryl could produce tornadoes.

10.   These rotating storms, called supercells, can produce tornadoes.