Large disc with small rectangular lights sighted on our near ground and the took off leaving vapor trail

My weekend farm is located at ((address deleted)) Nemo, TXU. It is in the country. Across my front field, my nephew and I were leaving our barn and I saw a square bright light with a square halo around it across the county road on the side of a tree covered hill. I asked him, “ what is that light”.  He joked and said it must be some sort of ritual in the woods and left to go to his house behind the barn. I got in my ATV and backed it out of the bar so that the headlights shined on the area where the light was shining. Within seconds the light turned off and then a large silhouetted disk with rectangular lights around the edges began to rise until it was above the trees, then slightly moved to the right. It’s size was about the length of a school bus. I was in shock because of what I was watching, then it zipped away almost undetectable except for a distinct vapor trail. The trail was in a large arc up into the clouds. There was a glow above the clouds and then a la! rge bolt of lightening, then thunder. A downpour ensued. Whenever there was lightening, I could see the vapor trail although it was dissipating quickly. Amazing!