September 21, 2011 7:01 AM

In Joplin tornado's aftermath, NOAA considers warning system changes

Lives were saved in Joplin, Mo., because sirens screamed and TVs and radios broadcast warnings minutes before an EF5 tornado swept through the city, ultimately killing 162 people. But, according to a government report released Tuesday, more lives might have been saved had people not grown so “desensitized” to such warnings, causing them to either delay taking cover or ignore the initial threat.

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