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Originally posted by Zaphod58
Is there a military base nearby? The TARS balloons are generally in the south, and Caribbean, but I'm sure there are others in operation. You could be seeing the strobe that is attached to warn other aircraft that the balloon is there.
The US Coast Guard also has a Mobile Aerostat Program, where they deploy balloons from ships to monitor the area around them, so you could be seeing a testing program for an Aerostat.