Endeavour's 6:51 p.m. launch is now "red" for one weather criteria - the threat of lightning within 10 nautical miles of launch pad 39A at Kennedy Space Center.
However, the threat is from a storm to the south that is expected to leave the area within the next 15 to 20 minutes.
Check out this interactive graphic by Florida Today's Dennis Lowe for a primer on why the shuttle needs to avoid lightning at liftoff.
Space news and analysis from Kennedy Space Center and Cape Canaveral 
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