I just got home from an afternoon at Epcot and a few notes around this. It was not raining when it started, nor had it rained at all in the area for more than 12 hours prior to when this started. And for those trying to convince others that SSE does this every time it rains, I'm sorry but that is simply a false statement. There was an astonishing amount of water flowing out of the bottom of the globe and it was not raining.
The attraction has been closed since late-morning today and never opened again throughout the day and I do not expect that you'll see it re-open for quite some time. When I left a little over an hour ago, the flow of water had diminished greatly but there was still some flowing right behind the FP+ kiosk for the CM at the first scan station. Everything I'm hearing is that something broke in the chilled water system for the A/C in the building.