Changes

Before thunderstorms develop, a change in wind direction and an increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower [[atmosphere]]. Rising air within the updraft tilts the rotating air from horizontal to vertical. An area of rotation, 2-6 miles wide, now extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation.

Before thunderstorms develop, a change in wind direction and an increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower [[atmosphere]]. Rising air within the updraft tilts the rotating air from horizontal to vertical. An area of rotation, 2-6 miles wide, now extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation.

==Occurence==

==Occurrence==

Tornadoes can happen at any time of the [[year]] and at any time of the [[day]]. In the southern states, peak tornado season is from [[April]] through [[June]]. Peak times for tornadoes in the northern states are during the late [[summer]]. A few southern states have a second peak time for tornado outbreaks in the fall. Tornadoes are most likely to occur between 1 p.m. and 7 p.m.

Tornadoes can happen at any time of the [[year]] and at any time of the [[day]]. In the southern states, peak tornado season is from [[April]] through [[June]]. Peak times for tornadoes in the northern states are during the late [[summer]]. A few southern states have a second peak time for tornado outbreaks in the fall. Tornadoes are most likely to occur between 1 p.m. and 7 p.m.

[[Category:Meteorology]]

[[Category:Meteorology]]