Advice is to check with your airline before attempting to travel
The north terminal isn’t directly affected, apparently, except that they’re trying to get passengers off planes that would have gone in to south, and of course that’s adding to delays.
And it’s really hard to either arrive at or leave the airport at all, as trains aren’t stopping, buses have been suspended and minicabs/ubers from nearby stations are completely swamped (and according to one report, charging silly prices)
No word at all on how long incident might last, so no way to predict size/duration of backlog of delayed flights