The pilot was engaged in a local soaring flight when she judged that an outlanding was necessary. The wind conditions were assessed by observing dust from vehicles on a dirt road and a landing pattern was established. On final approach into a large cleared area, the pilot became aware of an increased ground speed and altered the flight path to land into rising terrain. During the landing, the right wingtip struck the ground and the glider was substantially damaged during the ensuing ground loop. On alighting from the glider, the pilot became aware of strong variable conditions that had induced a tailwind component on landing and probably caused the left wing to lift during the landing roll.