The following banner has been being shown at present when Stack Network is under maintenance.
Now it has been observed that @StackStatus doesn't tweet the status update more frequently. For example, today the network was under maintenance but the most recent tweet was showing update till only 2nd of September, though later on it has been updated when maintenance was completed.
And I think "our status blog" a.k.a. stackstatus.net does nothing more than redirect visitors to a particular meta post.
So, I suggest to include a link to the meta post describing the planned maintenance so that visitors reading the banner can get information what exactly is going and when it is expected to be normal.
Following is an example of a possible improvement:
Note: This may not be applicable to unplanned maintenance.