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tornado
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tornado

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A tornado photographed 35 km/22 mi southwest of Howard, eastern South Dakota, on 28 August 1884. This is the oldest known photograph of a tornado. In terms of annual numbers of tornadoes, only Australia can compete with the USA.

Extremely violent revolving storm with swirling, funnel-shaped clouds, caused by a rising column of warm air propelled by strong wind.

A series of tornadoes killed 47 people, destroyed 2,000 homes, and caused $500 million worth of damage in Oklahoma, Nebraska, Kansas, and Texas in May 1999.

A tornado can rise to a great height, but with a diameter of only a few hundred yards or less. Tornadoes move with wind speeds of 160-480 kph/100-300 mph, destroying everything in their path. They are common in the central USA and Australia.


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The controllers say the radios allow them to monitor tornado funnel clouds, but the FAA says controllers already have access to a "large amount" of weather information.
They cease to be so only when societal pressure (husbands, mothers, best friends, the media) causes them to question the readouts, to deny the evidence of a serious storm, to disregard the 200 mph winds and circling funnel clouds.
So far this week, two funnel clouds have been spotted in the southern Willamette Valley northeast of Eugene - one Monday and another Wednesday - but neither became a full-fledged tornado, and officials of the National Weather Service say it's not an uncommon weather phenomenon this time of year.
 
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