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Re:SpaceX CRS-6 Launch Webcast by sfeng on Monday April 13, 2015 @04:39PM (#9370331)
You can detect lightening using ground based detectors: http://en.wikipedia.org/wiki/Convective_storm_detection#Ligh...

This specific delay though was caused by convective clouds being too close to the launch. This was probably determined with either ground based radar, or visible/IR images from satellites.

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