Head to this page: https://www.ewn.com.au/info/facebook.aspx

  1. Choose the facebook EWN page according to the State you live in.
  2. Click the Like buttons to receive state-based alerts issued by EWN on your Facebook news feed.  
  3. After you click Like, go to the liked page and hover your mouse over the "Liked" button, select "Get Notifications".

Here is an example of South Australia's EWN facebook page: