Weather could keep a Falcon 9 rocket on the launch pad.
The SpaceX rocket is supposed to launch from Kennedy Space Center around 1:34 a.m.
But the launch is currently "no go" because of three different weather violations. There's a 60 percent chance that weather will prohibit the launch.
The rocket will carry an Echostar XXIII communications satellite into space.
The launch window lasts until 4:04 a.m.
The backup day will be early Thursday for the launch, which has a much better chance of good weather.
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