![NWS Jackson MS on Twitter: "Ever wonder how tornadoes form? It's not "when hot & cold air mix". Wind shear is needed to create spin. http://t.co/1tje5TKtd1" / Twitter NWS Jackson MS on Twitter: "Ever wonder how tornadoes form? It's not "when hot & cold air mix". Wind shear is needed to create spin. http://t.co/1tje5TKtd1" / Twitter](https://pbs.twimg.com/media/B3m1vq1CcAICZML.png)
NWS Jackson MS on Twitter: "Ever wonder how tornadoes form? It's not "when hot & cold air mix". Wind shear is needed to create spin. http://t.co/1tje5TKtd1" / Twitter
If cold air is heavier than hot air then why is hot air in low altitudes of the atmosphere (gravity affecting it more)? - Quora
![Air Pressure Can Change with the Temperature - Tree House Weather Kids - University of Illinois Extension Air Pressure Can Change with the Temperature - Tree House Weather Kids - University of Illinois Extension](https://web.extension.illinois.edu/treehouse/images/3291_1_large.jpg)