CAPE CANAVERAL, Fla. -- Space shuttle Endeavour's third launch attempt is being threatened by the risk of an afternoon or evening thunderstorm in central Florida.
This follows two delays last month caused by hydrogen gas leaks that have now been fixed.
Meteorologists see a 60 percent chance of unacceptable weather at launch time, 7:39 p.m. Eastern.
But NASA has at least until Tuesday to get the shuttle on its way to the international space station.
And the forecast gets better by the day.
Shuttle commander Mark Polansky says he doesn't worry about things he can't control.
And NASA manager Mike Moses says people often joke that with his biblical last name, he ought to be able to control the weather, but he just can't.