At Southfield Park on Thursday evening, Dean Weaver’s voice echoed across the skatepark. It was the Wasatch County Health Department’s annual skate park competition, and Hanz Lundskog, 16, was dropping in. “OK, he’s off,” Weaver announced. “Keeping up his speed.” Lundskog, hoping for a win, did not hold back. Dropping into the second-deepest bowl in the park, he looped around the walls and kept up enough speed to get air out of the bowl. He gra…