Friday launch forecast looks iffy

The first official weather forecast for the last shuttle launch isn't great.

There's a 60 percent chance of conditions that could prevent a launch during a 10-minute window, according to the Air Force's 45th Weather Squadron.

Atlantis is targeted to launch in the middle of the window, at 11:26 a.m.

There's concern about showers and thunderstorms within 20 nautical miles of the shuttle landing strip and clouds in the flight path.

The forecast improves Saturday and Sunday, with 40-percent and 30-percent chances, respectively, of conditions that could prohibit a launch.

Atlantis must launch on its first attempt to preserve the option of adding a day to the 12-day International Space Station resupply mission.
Read the official forecast here.