Posted: Tue, Jul 24, 2001, 7:57 AM ET (1157 GMT)

Poor weather at the Kennedy Space Center Monday night forced NASA to wave off two shuttle landing attempts, keeping Atlantis in orbit an extra day. Atlantis was scheduled to land at KSC at 12:37 am EDT (0437 GMT) Tuesday, but marginal weather conditions, including showers near the landing strip, led shuttle managers to wave off both that attempt and a second attempt at 2:14 am EDT (0614 GMT). NASA will try again Tuesday night, with two landing attempts scheduled for 11:39 pm EDT Tuesday (0339 GMT Wednesday) and 1:15 am EDT (0515 GMT) Wednesday. While the backup landing site at Edwards Air Force Base in California is available, NASA has elected not to activate it yet, since Atlantis can stay in orbit until Thursday.