Oklahoma tornado was stronger than Hiroshima bomb: How?

When the conditions are exactly right ??and they were, for the tornado that devastated Oklahoma City yesterday ??a tornado can unleash more power than the nuclear bomb dropped on Hiroshima.

By Seth Borenstein,?Associated Press / May 21, 2013

Left, a neighborhood in Moore, Okla., left in ruins on May 4, 1999, after a tornado flattened many houses and buildings in central Oklahoma. Right, flattened houses in Moore on May 20, 2013. Monday's powerful tornado in suburban Oklahoma City loosely followed the path of a killer twister that slammed the region in May 1999.

AP Photo

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Everything had to come together just perfectly to create the killer?tornado?in Moore, Okla.: wind speed, moisture in the air, temperature and timing. And when they did, the awesome energy released over that city dwarfed the power of the atomic bomb that leveled Hiroshima.

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On Tuesday, the National Weather Service gave it the top-of-the-scale rating of EF5 for wind speed and breadth, and severity of damage. Wind speeds were estimated at between 200 and 210 mph. The death count is 24 so far, including at least nine children. The United States averages about one EF5 a year, but this was the first in nearly two years.

To get such an uncommon storm to form is "a bit of a Goldilocks problem," said Pennsylvania State University meteorology professor Paul Markowski. "Everything has to be just right."

For example, there must be humidity for a?tornado?to form, but too much can cut the storm off. The same goes with the cold air in a downdraft: Too much can be a storm-killer.

But when the ideal conditions do occur, watch out. The power of nature beats out anything man can create.

"Everything was ready for explosive development yesterday," said Colorado State University meteorology professor Russ Schumacher, who was in Oklahoma launching airborne devices that measured the energy, moisture and wind speeds on Monday. "It all just unleashed on that one area."

Several meteorologists contacted by The Associated Press used real time measurements, some made by Schumacher, to calculate the energy released during the storm's 40-minute life span. Their estimates ranged from 8 times to more than 600 times the power of the Hiroshima bomb, with more experts at the high end. Their calculations were based on energy measured in the air and then multiplied over the size and duration of the storm.

An EF5?tornado?has the most violent winds on Earth, more powerful than a hurricane. The strongest winds ever measured were the 302 mph reading, measured by radar, during the EF5?tornado?that struck Moore on May 3, 1999, according to Jeff Masters, meteorology director at the Weather Underground.

Still, when it comes to weather events, scientists usually know more about and can better predict hurricanes, winter storms, heat waves and other big events.

Source: http://rss.csmonitor.com/~r/feeds/science/~3/0MhY9mG-8rw/Oklahoma-tornado-was-stronger-than-Hiroshima-bomb-How

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