What the fck am I hearing

Im gonna lay this out in a timeline so it makes sense

In the blue ridge mountains

Foggy so I decided to go for a hike

Nearing sunset

Completely silent, no birds, far away from any roads so no cars etc

I’m a videographer so I was out there filming, I see a nice rock so I go and sit down on it

I put my gear away because I forgot to charge my camera batteries and it died

Sat on this rock for 10 minutes enjoying the silence and fog

Out of nowhere this strange howl/wail like sound that stays somewhat constant in pitch

WAY too low to be a coyote + it didn’t have enough low to high

it wasnt an “aaaWOOO” it was just a “wWOOOOo”

Didn’t sound anything close to a fox

Wolves aren’t anywhere near VA

It lasted 6-8 seconds on a 10-20 second interval so im almost positive it wasn’t an owl

Sounded very powerful and echoes so im assuming this would be coming from a larger animal? Im not sure though

It sounded like it got progressively closer to me so I bolted out of there fast (as fast as you can with 10lbs of camera gear on a wet trail)

What could it be? Any help is appreciated