http://sweaverflies.com/final-flight-green-swamp-sport-klassic-april-1-2017/

The difficulty of the flight revealed itself just after launch. I
started in weak lift east of the field, but found it challenging to maintain
altitude. There were some gliders that had launched after me circling northwest
of the field, and I decided to go for them. I arrived at 1200 feet and began the
long process of working what little lift we had. Two gaggles formed, north and
northwest of the field. I stuck in the northwest area, but it became evident the
north crew was getting more altitude. The gaggle I was in began shifting east to
the better area, but I glimpsed a bird circling even more west. Knowing I could
always relaunch if I lost altitude, I went for the bird and found lift at 350
ft/min, strengthening with altitude. I radioed my team members over and they
began thermaling below me. Pretty soon, the rest of the gliders joined us and I
topped out at 5075 feet.