FORT WAYNE, Ind. (WFFT) — Visitors to Mammoth Cave National Park in southern Kentucky got a special treat on Sunday.
Fog formed in the Rotunda Room.
— Mammoth Cave NP (@MammothCaveNP) June 15, 2021
This site is one of the most visited places inside the cave, according to the National Park Service.
It's the sixth largest room in the cave and is about a quarter of an acre in size.
But why did this happen?
It happened when a storm passes over the area above ground that causes a quick drop in temperature outside.
This pressure change caused the airflow to reverse, pulling moist air into the caves.
The warm, moist outside air condenses and forms fog when it comes in contact with the cool, dry air near the cave's ceiling.
When this happened, dense fog filled the Rotunda Room.
Today we had a large and unexpected storm come through the park which caused a quick drop in the temperature. This pressure change caused the airflow to reverse, pulling into the cave, resulting in a dense fog filling the Rotunda room! pic.twitter.com/tTr4RUvRcC
— Mammoth Cave NP (@MammothCaveNP) June 13, 2021
Typically, the caves temperatures don't drop drastically enough to help fog form.
The average temperature instead the cave is 54°.
The fog lasted for about 10 minutes before it dissipated.