Ember.js fails to install globally

I ran the command to install Ember.js:

npm install -g ember-cli

Then when I run:

Ember -v

I get error: "The term ember is not recognized as the name of a cmdlet, function, script file or operable program ..."

I added the system environment variable $NODE_PATH = %AppData%\npm\node_modules

I see ember-cli folder in the $NODE_PATH

How can I install ember globally?