found this on a dead BBS mirror — the "Upsweep" thing NOAA never closed the book on

ok so i was digging through one of those archived geocities-tier acoustics pages (link's half dead, half the images 404) and the OP over there had saved a thread about this sound called Upsweep. saving it here before that mirror goes too. basically NOAA's been picking it up on their equatorial hydr……