The Nordic Skiing Association of Anchorage has banned its Junior Nordic program from using the sand dunes at Kincaid Park after three young skiers were caught in an avalanche there. One child was fully buried by snow, and two others were partially buried, but all were quickly removed by coaches and parent volunteers and were unharmed. The sand dunes are the only place in the park where the terrain can produce an avalanche, according to Haley Johnston, business specialist for NSAA. The incident highlights the fact that avalanche danger is not limited to alpine slopes, said Wendy Wagner, director of the Chugach National Forest Avalanche Information Center.