Storm Shelters Few in 'Tornado Alley'

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Seventy-five percent of the world's tornadoes occur in the United States, yet few people who live in "Tornado Alley" bother with the trouble and expense of a proper shelter from the storms.

Mel Evridge, 69, a retired builder who experienced both Monday's twister in this Oklahoma City suburb that killed 24 and a still deadlier one in May 1999, is a proud member of that minority.

Not only did he put a storm cellar in the smart single-level house he built for his family in the 1970s, but he also opted to use Arkansas Hackett stone tough enough to withstand the worst of Oklahoma's climatic extremes.

Even then, Evridge told AFP as he collected debris from his front lawn, "I was just about as scared (Monday) as I was the first time."

Video: Giant Tornado Hits Oaklahoma

"Ever heard a jet throttle up when holding its brakes?" he asked in describing what a tornado feels like from inside a shelter. "That's what it sounded like. Just one big roar."

Yet few homes in the tornado-vulnerable Great Plains that stretch from Texas to the Canadian border are fitted with tornado shelters -- and public buildings even less so.

In the Oklahoma City area, perhaps 10 to 20 percent of homes have some kind of formal shelter, said John Snow, a professor of meteorology at the University of Oklahoma and an authority on the Great Plains' often unforgiving climate.

No state or local law in Oklahoma, the "bullseye" of Tornado Alley, mandates the installation of residential storm shelters -- and homeowners who do opt for them have to shell out upwards of $4,000 for the most basic option.

"Storm shelters are a good idea. That's a fundamental message," Snow told AFP in a telephone interview. "But there are awesome challenges to building them."

Besides the expense, the region's flat open terrain consists of clay, which expands when wet, contracts when dry and renders the kind of basements common in the eastern United States vulnerable to cracking and crumbling.

There's also the fact that tornadoes as potent as those seen in Moore, with winds of 200 miles (321 kilometers) per hour, are few and far between, compared to the far more common ones that are half as strong.

For those twisters at the low end of the five-step Enhanced Fujita scale, taking cover in the bathtub, under a staircase or inside a closet is typically good enough, Snow said.

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