MAPLETON, Iowa (AP) - It seemed like a Mapleton Miracle. A tornado with winds exceeding 130 mph barreled through this small Iowa town, flattening whole blocks and destroying 100 homes.
When the storm passed, more than half the town had been leveled. But the most serious injury was a broken leg.
Storm spotters who tracked the approaching twister were being credited Monday with giving residents a crucial 15-minute warning, allowing most people to take shelter and preventing the kind of tornado disaster that killed four teens at a Boy Scout camp near here in 2008.
Anytime a powerful tornado hits "and you don't have any serious injuries or deaths, you're lucky," Monona County Sheriff Jeff Pratt said. "We are just very fortunate."
On Monday, volunteers from all over Iowa streamed into town to begin cleaning up downed trees and rubble.
Tamara Adams, 37, was carrying tree branches to the curb outside her home Sunday when a stranger approached with a chain saw asking if she needed help. It was the closest thing to a "magic wand" she hoped to receive.
"Everybody's safe," Adams said. "Yeah, people are suffering now. But you've just got to do what you've got to do."
Damage-assessment teams began a street-by-street survey in Mapleton, a community of 1,200 about 45 miles southeast of Sioux City. The American Red Cross was offering health services, as well as food and water to emergency responders and volunteers.
Townspeople were grateful for the abundant help - and for the extra time they had to escape the storm.
Barbara Mayes, a forecaster with the National Weather Service in Omaha, Neb., said scientists realized two to three days in advance that there was a strong chance of severe weather. That early notice, combined with the visual sightings and instant weather reports, created a best-case scenario when the twister drew near.
"This is a good example of the process working like we want it to," Mayes said.
About 100 Mapleton homes were destroyed Saturday evening, displacing an estimated 600 people. At least 14 people suffered minor injuries.
The storm also uprooted the huge, centuries-old trees that give the town its name. The trees were wrapped around houses and tossed on top of cars.
The weather service said the tornado was on the ground for 31â„2 miles and measured three-quarters of a mile wide at one point. The twister was measured as an EF3 on the tornado-strength scale, which carries wind speeds of 136 to 165 mph.
The limited injuries were especially remarkable considering a high school play was being performed when the storm struck. Sections of the building's roof were peeled off, and windows were shattered.
As many as 400 people huddled in the school's basement until the winds died down, Superintendent Steve Oberg said.
"It's built like a bunker," he said. "They were in there safe. Nobody was freaking out or anything." No one in the school was hurt.