Afternoon showers gave way to heavy storms Wednesday evening. Wind downed power lines across Tarrant County, caused minor damage and left an unknown number of residents without power.Thunder started booming about 8:30 p.m., and less than 30 minutes later, the National Weather Service issued a flash flood warning for Northeast Tarrant County. Areas along Texas 183 and Loop 820 had received 2 inches of rain in about 30 minutes, according to a weather service advisory.Rain amounts ranged from 1 to 3 inches across the county, and the highest levels were reported in Haltom City near Beach Street and Western Center Boulevard, weather service meteorologist Jason Bunn said.Power outages were concentrated in North Richland Hills, Haltom City and Watauga. Quarter- to half-dollar-size hail was reported in those areas, Bunn said. Parts of Keller, Grapevine, Euless and Hurst reported power outages, officials said. About 22 flights scheduled to land at Dallas/Fort Worth Airport were diverted because of the storms, and 12 flights were canceled, airport spokesman David Magana said. The storms rolled in after the airports busiest time, and most flights had already arrived or departed the airport. Airport concessionaires stayed open until midnight to accommodate any stranded passengers, Magana said.