Just a comment...
Hey WingNut60, considering you live in Balikpapan and "know a bit about the area" I am surprised you don't take account of tropical rainstorms. Here in the middle of Singapore we have been seeing near daily rainstorms for the last week or two where you can't see more than thirty or forty feet in front of your face. So it wouldn't surprise me at all if no-one at sea level saw anything.