as the topic stated, I'm currently in a situation where the term "notification" is kind of over used, so I'm trying to find alternatives to emphasize the importance of the notification.

Here's the scenario - You are supposed to submit three documents at the end of the week, and it is now 2 days before deadline meets.

My first thought was something like a "Submission Reminder", but reminder felt a bit too soft. So I then think of "Overdue notification", however, it's not really overdue yet.

I'd want something that would let the user feel the sense of urgency and importance. Is there a better term for it?