Whilst watching a thunderstorm in the back garden with the neighbours we all saw a blue light flying behind the storm cell, as it came closer it changed to green and red, i grabbed my telescope and got a good look at it .I could see the lights were manufactured and not ball lightning. The lights then zig zaged around the storm cell at speeds that modern technology would not be able to match before shooting off to the south at what would have been thousends of MPH, this took place at around 2130pm, the object or lights then came back 5 min's later, stopped dead in the sky and then shot off to the south again. What ever it was hugged the back edge of the storm cell both times but did not enter the cell.