Severe Weather 5:20 pm Sun April 1, 2012  New, ramped-up tornado
warnings to start Monday  Joplin residents look through the
remains of their house on May 24, 2011, two days after an EF-5
tornado devastated the city. Credit (UPI/Tom Uhlenbrock)
Weather service officials say studies after deadly tornadoes in
Joplin, Mo., and other parts of the country last year found that
most people didn't heed the initial warnings about the oncoming
storms.  They also say people in tornado-prone areas have become
desensitized by frequent false alarms and don't always pay
attention to the first warnings.   The new, "impact-based"
warnings will describe how much damage a storm could cause.
Examples include: "COMPLETE DESTRUCTION OF ENTIRE NEIGHBORHOODS
IS LIKELY" and "MASS DEVASTATION IS HIGHLY LIKELY MAKING THE
AREA UNRECOGNIZABLE TO SURVIVORS."