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PPT : The Life cycle of a Tornado

* The “Life Cycle” of a tornado consists of four distinct stages.
* These stages were first determined during the Union City, OK tornado of 1973
* Most tornadic events are difficult to classify and may not exhibit stages that are obvious to the observer
* Sometimes events become unclear: one tornado weakens another appears, or single event?
* Tornados do not “skip” – gaps in damage path may indicate a temporary weakening in intensity

Beginning Stage: Tornado begins as a rotating wall cloud which quickly evolves into a funnel

Early Stage:Tornado funnel develops (may be transparent) and extends down from the cloud to the ground

Mature Stage: Tornado funnel reaches maximum width as well as maximum intensity then begins to shrink

Decay Stage:tornado may remain stationary and take on a ropelike appearance before dissipating

* Severe thunderstorms move into Ok, TX, Ks and spawn estimated 70 tornados, most occurred in Oklahoma
* In Oklahoma 40 people killed, 675 injured
* Damage: $1.2 billion
* Largest tornado outbreak in Oklahoma history
* 1,780 homes completely destroyed
* 6,550 homes damaged

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