just remember that once you get below the surface weather really doesn't have any affect on water flow. only in the shallowest of water does wind/waves have any affect on what happens below the surface. I have been scuba diving on a completely flat ocean and when it was pretty rough out, and once you get about ten feet down, you cant tell the difference, so whatever current/water flow is happening is not related to any day/night/weather cycle.
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