TIDAL STREAMS. Mariners should refer to the New Zealand Nautical Almanac for daily tidal stream predictions and other stream information. Complete spring and neap values for Tory Channel / Kura Te Au can be found in the New Zealand Nautical Almanac. The west (flood) stream can reach 5 knots and the east (ebb) stream is of similar strength. Weather conditions may considerably affect the tidal streams in Cook Strait.