[Geysers] Yellowstone Whispers

[Pat Snyder]

Recently I bought a book called "Weird U.S.A." by Mark Moran and Mark 
Scheurman. It lists strange things seen and heard throughout the 
country, much of it stuff like hauntings, odd museums, strange 
collections and the like. However, one item is about Yellowstone, and 
is called the "Yellowstone Whispers".

They are described as a "...strange natural phenomenon that takes place 
in the high country above Yellowstone Lake." It's a whistling sound 
that can last up to 30 seconds--usually between the hours of dawn and 
10 a.m. The book claims early trappers and Native Americans also knew 
about it (no record of how this was documented listed).

Has anyone heard of this legend/story before? Has anyone heard the 
whispers? Could it be something thermal causing this sound? Seems 
likely to me that it could be a fumarole or the like. Anyway, just 
curious.
Thanks!
Pat Snyder