(source: Storm King’s Thunder, page 109)

Micro-Worldbuilding Opportunities: Reading the description in this entry, especially at the chaotic weather at its peak, got me to thinking about an entry in Volo’s Guide to Monsters. Storm Giants, when they’re in their dying years, choose to transform themselves into a living storm, a form of transcendence called a Quintessent. I have my guess that such a creature is on top of this mountain, far beyond its mortal coil but still existing.