Essjaywhy 0 Posted December 10, 2023 Share Posted December 10, 2023 Hi Im looking for advice on live tidal currents from Windy. This image below is the Hauraki Gulf tide ebbing, the Firth is emptying and the live map has an overall northerly flow. But Windy has the Upper Waitemata is filling. We know the Gulf has some ripping tides like around North Head. Is there an accurate live tidal flow available , with actual rate of knots ? WYS just had a race on Saturday around Ponui in light airs and so I was looking for tidal patterns. Thanks Quote Link to post Share on other sites
Psyche 633 Posted December 10, 2023 Share Posted December 10, 2023 Quote Link to post Share on other sites
Psyche 633 Posted December 10, 2023 Share Posted December 10, 2023 Quote Link to post Share on other sites
Psyche 633 Posted December 10, 2023 Share Posted December 10, 2023 Quote Link to post Share on other sites
Psyche 633 Posted December 10, 2023 Share Posted December 10, 2023 Quote Link to post Share on other sites
Psyche 633 Posted December 10, 2023 Share Posted December 10, 2023 length of arrow = strength of flow but navionics has tidal and current predictions, as do paper charts but the above should give you a starting point Quote Link to post Share on other sites
Lindsay 31 Posted December 10, 2023 Share Posted December 10, 2023 19 minutes ago, Psyche said: length of arrow = strength of flow but navionics has tidal and current predictions, as do paper charts but the above should give you a starting point I think what Essjaywhy is asking for is actual live data, not predictions. I’d love to be able to access current live tide heights to determine if it’s safe to transit a bridge during king tides. The predicted tide height doesn’t account for variations due to air pressure. Quote Link to post Share on other sites
ex Elly 197 Posted December 11, 2023 Share Posted December 11, 2023 PredictWind now has PredictCurrent, but it will cost you a few hundred bucks. https://www.predictwind.com/predictcurrent Quote Link to post Share on other sites
CarpeDiem 430 Posted December 11, 2023 Share Posted December 11, 2023 2 hours ago, Lindsay said: I think what Essjaywhy is asking for is actual live data, not predictions. I’d love to be able to access current live tide heights to determine if it’s safe to transit a bridge during king tides. The predicted tide height doesn’t account for variations due to air pressure. I am not aware of any live tidal stream feeds. I believe everything we have access too is modelled from historically collected data. If no one else comes back with an answer I would suggest writing to LINZ and asking them. They run the tidal stations and will at least be able to point you in the correct direction... please let us know what you find out. This index enables you to identify the locations of current and historic sea level stations around New Zealand, on offshore islands (including Raoul Island, Chatham Islands and the sub-Antarctic islands), several South West Pacific islands and the Ross Dependency (Antarctica). This link may also be useful for calculating actual tide height: Unusually high or low barometric pressure, or prolonged periods of strong winds, can mean the actual sea level is higher or lower than the predicted height. Quote Link to post Share on other sites
khayyam 68 Posted December 11, 2023 Share Posted December 11, 2023 Atmospheric pressure won't change the tidal streams much. 1hpa pressure ~ 1cm tide. So predicted tides are going to be the main thing by far for the streams. Quote Link to post Share on other sites
Essjaywhy 0 Posted December 11, 2023 Author Share Posted December 11, 2023 Well there is definately a hole in the Web for live tides, who woulda thought in this age ! The Windy Tide Tab is way off. it even shows tides over the land. During the last AKL Am Cup i saw some very detailed tidal stream data , as a Course was right under North Head. thanks All Quote Link to post Share on other sites
Psyche 633 Posted December 11, 2023 Share Posted December 11, 2023 Tidal predictions are reasonably accurate, certainly enough for navigation purposes. I think the issue would be the cost for setting up and maintaining permanent sensors. Quote Link to post Share on other sites
CarpeDiem 430 Posted December 11, 2023 Share Posted December 11, 2023 3 hours ago, Essjaywhy said: During the last AKL Am Cup i saw some very detailed tidal stream data , as a Course was right under North Head. That was by Tidetech. They came here and did some recording at various locations and then did some hi-res modelling based on that data. Even the AC data wasn't real time. Tidetech made the data free. https://www.tidetechmarinedata.com/news/americas-cup-practice-day-2-auckland-tidal-currents Quote Link to post Share on other sites
Lindsay 31 Posted December 11, 2023 Share Posted December 11, 2023 Pretty sure the port has the actual current tide height. I wonder if they could make it available to the public. Quote Link to post Share on other sites
eruptn 95 Posted December 13, 2023 Share Posted December 13, 2023 GeoNet has real-time data for Auckland and Great Barrier (plus about 16 other sites) as part of the coastal tsunami network. The data is only up dated every 15 seconds. https://tilde.geonet.org.nz/ui/data-exploration Quote Link to post Share on other sites
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