Tides occur as a response to the gravitational attraction of the Sun and Moon and the rotation of Earth. There are three basic tidal patterns - diurnal, semidiurnal, and mixed. Diurnal tides are characterized by one high and low tide a day.
The pointy things that hang down from the cave's ceiling are stalactites. (A)
The pointy things that grow up from the cave's floor are stalagmites.
(I imagine wearing shorts and hiking through tall grass in the Summer, and I say to myself "When the Mites go up, the Tights have to come down.".)
A thunderstrom with a persistent rotating updraft is a Supercell