Padre describes the area quite well -
the weather is NOT "unpredictable" - it is all too predictable
often nice clear still mornings then around 11:00 cumulus starts to bubble up - you can pretty much guarantee rain and thunderstorms around Bogor starting at 13:00 - 13:30 clearing round 16:00 throughout the year - except maybe for a few days in June/July
For a long time Bogor was in the records as the thunderstorm capital of the world
Looks like he clipped a ridge coming off Gunung Salak - a couple of kms further north and he'd have had a lot of clear air under him but ..........