Couple sees bright flashing lights, beams, and obtrusive noise.

It was late night, and I was walking into my partner's room to lay down.  Upon entering the room, she told me she had seen a bright light shining into the room and was abnormally concerned.  
I turned to look out into the back yard, and within seconds, a bright light shifting from green, blue, white and then a small flash of red.  It lasted between 1-3 seconds and was incredibly bright.  
We threw open the window and tried to listen for any noise or to see anything.  There was a low grumbling noise similar to rolling thunder, and within a few moments, another multicolored bright flash lit the sky and backyard.  
This time, late in the flash a sharp, electric buzzing noise chimed in and gradually faded away along with the light.  
Shocked, my partner ran to wake her siblings while I watched the window, and then met up with her father.  Upon going outside to inspect the sky there were no more flashes, but after the incident, there remained a red tinted glow in the horizon! for an extended period of time.