CAPE CANAVERAL, Fla. (AP) — Shuttle Discovery’s astronauts aimed for a Thursday evening landing to wrap up their successful space station delivery mission, but late summer storms threatened to keep them up an extra day or two. Mission Control said Wednesday that “the weather will pose a challenge” for bringing Discovery home. The forecast called for a chance of thunderstorms. Conditions were expected to worsen Friday and remain poor Saturday.–Contact The Daily Reveille’s news staff at [email protected]