What does AMD mean on this Turbulence chart?

[RyanB]

I’ve never seen this and can’t seem to find its meaning. What does the “AMD” circled in red mean?

Thx

 

[Doug Reid]

Amended maybe ?

 

[GeorgeC]

Amended?

 

[rhkennerly]

I have understood it to be “amended,” but I can’t find a reference either.

 

[midlifeflyer]

Not sure but I don't know of any weather product which uses AMD other than to mean "amended." That's a turbulence forecast chart, right?