WTF Were Those Two Bright Blue Flashes South of Downtown Seattle

I was just walking over to the window to close the curtains when I saw a quick, bright blue flash from the south. It was followed by a second one about 2 seconds later. I live in downtown, and the airports (SeaTac and Boeing Field) are south of me by a few miles. I didn't hear anything following the flashes, and there's nothing on the news about it. It almost looked electrical, like a transformer blowing, but if it was, it was either really big, or much closer than it appeared. It seemed to be on the horizon because the clouds above it lit up too. The weather is wet, rainy and slightly windy, but nothing like the windstorms we can get.

In addition to the airports, the harbor and docks are that way, as well as some industrial areas, hospitals and the sports stadiums. It could have been pyrotechnics from the stadiums, but I don't know anything going on. The Huskies lost, but why would they be setting off stuff at Qwest Field for that?

If you're in the area, or looking at a map, it was due south of downtown, like the SODO, SeaTac, or Georgetown areas.

Anyone else see or hear anything?