MOORE, Okla. — 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 the Oklahoma City suburb of Moore and turned Wheeler’s son’s school to 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.

“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,” Wheeler, a fifth-grade teacher whose family has survived two deadly tornadoes, said Friday.

The Wheeler family retreated underground nearly a dozen times Wednesday night, when powerful storms 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.