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MOORE, Okla. (AP) — When spring arrives in Oklahoma and conditions are right for tornadoes, David Wheeler and his family don't take any chances.
Two years ago, a top-of-the-scale twister tore a miles-long path through this Oklahoma City suburb and turned Wheeler's son's school into a pile of rubble. That's when he installed a small underground shelter in his garage. Now the family regularly drills on what to do if the skies turn ominous.
"Today we've been nervous," Wheeler, a fifth-grade teacher whose family has survived two deadly tornadoes, said Friday. "We've done some dry runs before the spring. I made the kids go down there by themselves, and we've done the same thing with me, the wife and the kids, all together."
The Wheeler family retreated underground nearly a dozen times on Wednesday night, when a powerful thunderstorm that rumbled across the southern Plains produced more than 50 tornadoes. The menacing clouds had barely vanished before forecasters began warning of another system that could produce even more violent twisters through the weekend in parts of Kansas, Oklahoma and North Texas.
"We're going to see storms that present the risk of a full gamut of severe weather," including large hail, high winds and tornadoes, said Todd Lindley, a meteorologist with the National Weather Service.
A few tornadoes touched down Friday night in Texas and Oklahoma, but no damage was reported. The main threat seemed to be flooding from heavy rains in Oklahoma. Officials closed some roads, including part of Interstate 44 in Tulsa and were telling residents in one neighborhood in Shawnee that a lake dam was close to being breached.
The Plains states were not the only ones with threatening skies. Twin weather systems stretching from the Carolinas to California produced an unseasonably early tropical storm in the Atlantic and a late snowstorm in the Rocky Mountains.
Snow was also possible in the Nebraska Panhandle, which could get up to 5 inches, and parts of South Dakota, which could receive as much as a foot, according to the weather service.
Heavy rain that accompanied the last round of storms has swollen Oklahoma creeks and rivers, dramatically increasing the likelihood of flash flooding as the next round of storms approaches, Lindley added.
"There's a lot of standing water out there, and these storms are not moving terribly fast, so they're producing a lot of water in some places," he said.
One deluge was so heavy that a 43-year-old Oklahoma City woman drowned after becoming trapped inside her underground storm cellar.
"It just flooded with her in it, and she couldn't get out because it was like a river coming down on top of her," police Sgt. Gary Knight said. "I don't recall it ever raining like that before."
Skylyna Stewart's body was discovered in an older, underground shelter detached from the home.
The 7.1 inches that fell in Oklahoma City was the third-heaviest rainfall for any day on record, dating back to 1890, said state climatologist Gary McManus. Radar data from the part of the city where Stewart's body was recovered indicated as much as 8 to 12 inches may have fallen.
"Part of the problem was that we had gotten a lot of rain earlier," McManus said. "The soils were moist, and the rain had nowhere to go."
A few miles away in Moore, Kelly Ruffin said she and her family took shelter from the storms in an underground shelter installed in their garage when water from the heavy rains began leaking in.
"It was a heavy trickle at first, and within about 10 or 15 seconds, it was gushing," Ruffin said. "We had to decide if we were going to stay down there and drown or get out, because the sirens were going off. We decided to get out."
Wheeler and his family are not the only ones who sought extra protection after the 2013 tornado that killed 24 people, including seven children who died in an elementary school.
In the two years since, the city has issued more than 3,000 storm shelter permits. City officials estimate that about 40 percent of homes in Moore now have shelters, spokeswoman Deidre Ebrey said.
Blake Lee of F5 Storm Shelters & Safe Rooms described the drowning as a "really, really freak deal."
"It was a flash-flooding situation, and we got more rain yesterday than we typically get in a month," Lee said.
It's not uncommon for an underground shelter to leak, Lee said, and he encouraged people who have one to check them every few months to ensure they're not filling up with water.
"It can happen," he said. "But it's a really easy fix."
Follow Sean Murphy at www.twitter.com/apseanmurphy .
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