How Do Tornadoes Form?


By By Steve Pool

SEATTLE - Tornadoes are very complex systems and thus are difficult to forecast. First, you need a strong thunderstorm and warm, moist air near the ground. Strong thunderstorms will have strong upward moving winds as the warm air races upward, and downward moving winds from the heavy rain and hail falling.

These wildly varying winds will cause winds to be flowing from different directions near the ground. The colliding winds will cause a spinning horizontal tube of air along the ground. This tube will then get picked up by an updraft and brought into the thunderstorm, now making the cone of spinning air vertical. It's this spinning combined with strong updrafts that make a tornado, and why tornadoes work like a vacuum -- they're pulling air upward.

For More Information:

Your Photos

YouNews Sunset Beach, Oak Harbor Sunset Beach, Oak Harbor
I took this photo tonight at 4:37. Just a calm and beautiful day on the Salish Sea.
YouNews Bordeaux & Paris Bordeaux & Paris

This is my UW daughter and her weekly video from Paris......I think she does a great job and would like to share with others.......especially touching seeing video of where the attacks happened and her feelings....a future news caster...