ST. LOUIS (AP) _ Weather problems Friday forced millionaire adventurer Steve Fossett to give up his latest effort to travel around the globe in a balloon.

``The determination has been made to bring the balloon down,'' said Liam Otten, spokesman at Washington University in St. Louis.

He was skirting the border between Uruguay and Brazil, Otten said. It wasn't clear which side of the border he would end up on, he said.

``They are currently looking at where to bring him down. They don't have a site,'' he said.

By Thursday evening, Fossett had traveled more than 12,000 miles, making the balloon flight the second longest ever, the longest solo flight on record and the longest flight in an unpressurized gondola. He launched Aug. 4 from Australia in his fifth bid to become the first solo balloonist to circle the Earth.