Best practice to dismiss a modal once someone has read it

On a site I am working on, I want to be able to display a model with news in it when the app opens.
Once the user has read it I don’t want it to appear again. This will be multiple news items maybe 2 or 3 a week.
What would be the best way for this to be done. Keeping in mind the news will have different ID’s from the database and I only want the new ones to show.