I am seeing about creating a new warning icon. The existing one is orange and has a white "!" symbol. The ! symbol is difficult to see. The outline looks like a dialog window more than an alert too.
Maybe we can make it easier to understand some how.
my first thought was something like this shape...I will leave it up to Tim to decide what is best in the end... https://cdn2.iconfinder.com/data/icons/picons-basic-2/57/basic2-085_warning_attention-512.png
This is done. Tim added it, and I updated the warning icons in the code with what I could.