The water here of Daytona Beach has been steadily plummeting from the upper seventies into (now) the mid forties offshore. According to diver reports the red-green murk on the bottom only continue to get worse and the fish are being killed by the cold. Does anyone have a clue what causes these so called "Gulf stream upwellings"? I know they are common here for a couple of weeks during the summer every year, but this has been going on since early June - far longer than anyone in the area is accustomed too. I'm just curious to see if this happens elsewhere and is anyone knows what causes it?