On May 22, 2011, an EF-5 rammed through Joplin, Mo. More than 150 people died, more than half in their homes. It was the first twister to claim more than 100 lives since a 1953 tornado in Flint, Mich. That twister pre-dated the use of radar and tornado forecasting.
Scientists still do not exactly know how tornadoes form or why one thunderstorm will produce a tornado and another will not. Weather forecasters are approaching the limits of their prediction capabilities.
But even the most accurate forecasts are useless without people taking, and demanding, action.
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