The long white cloud.

[Jon Bev]

This is what New Zealand was known as, I have only seen this phenomenon once and this was it, I grabbed a shot, but I was stumped with nowhere to go for a higher view. I realize it looks like a plane's vapour trail but it is not.

 

[Jon Bev]

I have found another one.

 

[AlanLichty]

Unusual cloud - and you get these frequently enough that you have a name for them?

 

[JimFox]

Oh wow! That's so cool Jon. What a weird looking phenomenon. I wonder if @Douglas Sherman has more information on that type of cloud?

 

[Jameel Hyder]

Very interesting phenomenon.

 

[Jon Bev]

Unusual cloud - and you get these frequently enough that you have a name for them?

No Alan this is the only one I have seen.