Tornado numbers still at all-time lows for the modern record.
WASHINGTON - Wind, humidity and rainfall combined precisely to create the massive killer tornado in Moore, Okla. And when they did, the awesome amount of energy released over that city dwarfed the power of the atomic bomb that leveled Hiroshima.
On Tuesday afternoon, the National Weather Service gave it the top-of-the-scale rating of EF-5 for wind speed and breadth and severity of damage. Wind speeds were estimated at between 200 and 210 mph.
Several meteorologists contacted by The Associated Press used real time measurements to calculate the energy released during the storm's life span of almost an hour. Their estimates ranged from 8 times to more than 600 times the power of the Hiroshima bomb with more experts at the high end.
The tornado at some points was 1.3 miles wide, and its path went on for 17 miles and 40 minutes. That's long for a regular tornado but not too unusual for such a violent one, said research meteorologist Harold Brooks at the National Severe Storms Laboratory in Norman, Okla. Less than 1 percent of all U .S. tornadoes are this violent -- only about 10 a year, he said.
With the third strong storm hitting Moore in 14 years, some people are wondering why Moore? It's a combination of geography, meteorology and lots of bad luck, experts said.
If you look at the climate history of tornadoes in May, you will see they cluster in a spot -- maybe 100 miles wide -- in central Oklahoma "and there's good reason for it," said Adam Houston, meteorology professor at the University of Nebraska, Lincoln. That's the spot where the weather conditions of warm, moist air and strong wind shear needed for tornadoes combine in just the right balance.
The hot spot is more than just the city of Moore. Several meteorologists offer the same explanation for why that suburb seemed to be hit repeatedly by violent tornadoes: "bad luck."
Scientists know the key ingredients that go into a devastating tornado. But they are struggling to figure out why they develop in some big storms and not others. They also are still trying to determine what effects, if any, global warming has on tornadoes.
The National Weather Center; http://www.nwc.ou.edu/
Seth Borenstein can be followed at http://twitter.com/borenbears
It's official, an EF1 tornado touches down south of Orrville in Wayne County.
Ohio had its share of tornadoes in the last month. But, nationally, tornado numbers are low.
After severe damage caused by a tornado, Ursuline College has reopened for business.
Jamie Orr walked Ursuline College's campus on Monday still reeling from how close she came to being struck by a tor
Residents remove trees and branches from yards. Ursuline College community turns out to view damage on campus. Pepper Pike mayor may need help from regional sewer district to remove trees and branches from creeks.
Four tornadoes touched down in northeast Ohio during Wednesday's storms, according to the National Weather Service.
National Weather Service in Pittsburgh has confirmed that a tornado hit Mineral City Wednesday.
The National Weather Service has confirmed a tornado touched down in Ashland County near Rowsburg Wednesday night.
A possible tornado touchdown was reported in Seneca County Monday night.