If anything, the fall of the alleged upper water would have generated a lot of heat. think re-entry
Er - it depends how this water was 'miraculously' held up there. Plus the waters covered the surface of the earth for best part of a year. How long would they have held their 're-entry heat'?
And what about the waters that came from below? How much of the water covering the mountains came from the water canopy and how much came from under the earth?
Genesis 7:11 In the 600th year of Noah’s life, in the second month, on the 17th day of the month, on that day all the springs of the vast watery deep burst open and the floodgates of the heavens were opened
(As I type this I wonder how I ever managed to stop thinking for so long.)