Just one of the many problems with the whole vapor canopy nonsense.
Go drop an ice cube into an iron smelting furnace.
Yeah Noah's ark would have just glided along on molten granite
And yet there is evidence of an abrupt end of an ice age, isn't there?
I don't know if the canopy is vapor because the description is waters above vs waters below.
As for the ice cube, the description in the narrative immediately before the breaking into a deluge is heavy rain. There is no insufferable heat mentioned nor liquidation of mountains.
Nearly every culture has a flood and survival narrative. In the NW US, the Klamath's say that a skilled archer wove a raft with arrows or spears as the flood came, and took a couple animals with him. Why would this manifest so widely and have basic consistencies?
The narrative is not written like fantasy or "religious" in many ways (like imitation accounts of Christ or saints); it bothers with a number of reality-based details. It (the segment from Adam to Noah) also depicts homo sapiens with all the same features as we find from its period on: worship, artwork, records.
There also remains a number of indicators of rapid massive flooding and climate changes. From piles of dinosaurs bones, to tropical plants trapped under the Sahara to temperate-climate food in mouths of mammoths in Siberia frozen too quickly to swallow it.
One other note: Lake Helena (ice-trapped lake east of the Cascades until about 1000 AD) is an indicator that not all flooding had to happen at the same time. Ie, the end of an ice age would feature flooding wherever the temperature changed abruptly but there could still be anomalies like Lake Helena 8000 years later from that flooding that didn't finish their business until that recently.