EL PASO, Texas — The sound of rolling thunder in this border city’s convention center signals that the conference venue has once again been transformed into a bowler’s paradise for the 2015 USBC Open Championships. With the tournament in full swing, the United States Bowling Congress expects more than 7,000 teams – bringing about 100,000 visitors all told – to visit El Paso throughout the 128 days of competition from March 7 to July 12. This is the first time in the tournament’s 112-year history that it will be hosted in El Paso, following the USBC Women’s Championships that was held here in 2010. Albert Williams Jr., from Prince George, Virginia, a first-time tournament participant, said he was pleasantly surprised with the unique venue. “I knew El Paso was out here, but I didn’t think that there would be anything here big enough to host this kind of event.