Tornado ?

I encountered what i thought was a tornado not too far from camp in chapter 3. I didn't think much of it other than to get tf away, but when I googled it there doesn't seem to be much about it online? Im a casual player and only started playing the game a week ago so haven't looked into stuff so didn't know this could be a rare event or smth.

All the reddit post im being directed to on Google are people questioning the validity of people's claims. Is anyone able to check the code to confirm their existence??? If it wasnt a tornado what was it?