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The answer is complicated.
When there is a significant difference between the speed and/or direction of the wind at different altitudes the air can start to roll. This is called wind sheer.
If there is a thunderstorm in the area, usually along a boundary between air masses, the wind sheer can be taken into the storm's updraft and start the storm rotating.
The storm is now a supercell, a storm with a powerful, rotating updraft called a mesocyclone.
Under the right conditions, which are still not fully understood, this rotation can tighten, intensify, and extend towards the ground to become a tornado.
What else can I help you with?
Can hurricanes occer in ny?
yes
What unique weather patterns occur in the marine biome?
Fart Blaster may occer, but some tsunamies may also occer
When do the Olympics occer?
ever 4 years
Does helium naturally occer as a gas?
Yes
Where do tornadoes most occer?
Tornadoes have occurred in just about all places that get thunderstorms. Thousands have been documented in different places and thousands more have doubtless gone undocumented.
When does a lunar eclipse occer?
When the Earth casts a shadow on the moon.
On what day did the Battle of the Alamo occer?
November ,5 1867
How doeslight occer?
learn to spell and someone might answer your question
When does a tie-breaker occer?
at the end of a game when the game is tied
How do seasons occer?
the earth tilts a diffrent way from the sun
How many events occer in a decathon?
There are ten events in a decathlon.
How often does a sesquicentennial occer?
Every 150 years a sesquicentennial occurs.
