flashing green light zig zagging across the sky and making a humming noise as it flew over me.

green/teal colored flashing light over the Oquirrh mountains going down at a angle I thought something was crashing.  I then thought I lost the flashing light when it appeared above me again making crazy flight patterns zig zagging going across the flight pattern while planes were taking off and landing. The light still flashing it was traveling at a high rate of speed when it finally went north and I lost sight of it.  I was alone walking my dog around our apartment complex.  It made a humming sound as well