HOLY COW!! Most of the time when somebody posts this question it's just A/C drainage but I know dang well it hasn't been that humid up there over the past couple days. Just came back home this morning. :thumb: Of course I suppose you could have had a blocked A/C drain that let free to have that much build up.
It's hard to tell form the pics, is there any colour to it or is it black like the photos show?
then my guess is it's water. unless you have just water in your cooling system then it's either your AC or windshield washer. check all of your fluid levels just to be sure though, that's easy enough to do.
Based on the location in the photo, it's not the windshield washer fluid. I think it's the AC. As RRToad said, it's probably a dirty drain hose that had a bit of a plug which came undone after a bit of time.