Dan Foster Posted February 11, 2019 Share Posted February 11, 2019 Tide and current data for complex river/harbor/estuary interactions like the Portsmouth, NH area drive me nuts. NOAA gives a webpage for each tide or current station, but there's no "big picture" that shows how high tide at various points up the Piscataqua and into Great Bay lags the high tide at the entrance to Portsmouth Harbor. Do you have a resource you use for these kinds of questions? After hours of reverse googling, I managed to find almost exactly what I was looking for, 300 pages into NOAA's Tide Tables - 2019 East Coast of North and South America Including Greenland Here's a PDF with just the four relevant pages for our area, showing the lag in high and low tides for subordinate tide stations relative to the reference station. Maine Tidal Differences.pdf Have any of you found a more accessible source for this information? I'm currently interested in the Portsmouth/Piscataqua region, but I'd really like a general solution that covers the entire coastline. Quote Link to comment Share on other sites More sharing options...
mhabich Posted February 11, 2019 Share Posted February 11, 2019 Ah, one of my favorite tomes. Tides and Currents in Portsmouth Harbor, A. J. Hoskinson, US Coast and Geodetic Survey Special Publication No. 150, 1929 https://babel.hathitrust.org/cgi/pt?id=uc1.$b72168;view=1up;seq=5 Should be at https://library.noaa.gov/Collections/Digital-Collections/USCGS-Special-Pubs , but the links from there aren't working now. There are similar pubs for other areas, all about as old. Thanks for finding those tide tables. Hadn't found that before, and it's just what I need for something right now... Quote Link to comment Share on other sites More sharing options...
mhabich Posted February 11, 2019 Share Posted February 11, 2019 There's one other source you should always search for a question like this...right here. https://www.nspn.org/forum/topic/7814-tides-and-currents/ Quote Link to comment Share on other sites More sharing options...
EEL Posted February 11, 2019 Share Posted February 11, 2019 Dan: You might find the Tidelog publication (available at many chandleries) helpful as it contains similar charts for tide levels and currents allowing you to get a sense of how those items vary from certain stations. That said, the Portsmouth area can be a puzzle palace and time on the water there is very beneficial along with published data. Ed Lawson Quote Link to comment Share on other sites More sharing options...
Daniel Carr Posted February 11, 2019 Share Posted February 11, 2019 Here is a source of tide and current data that I ran across last year. I have not used of ground truthed this source for Portsmouth Harbor but it has been reliable elsewhere. https://www.sailwx.info/tides/tidemap.phtml Quote Link to comment Share on other sites More sharing options...
Dan Foster Posted February 11, 2019 Author Share Posted February 11, 2019 Just as an example of how this data could be displayed in a useful form, here's a website that lets you drag a slider to see the currents ebb and flow around Puget Sound. Move the map a little to the north and look at the current in Deception Pass! http://www.deepzoom.com He plots the tide and current stations for our area, but the current slider doesn't work here. I would love to see this visualization for the Piscataqua. Quote Link to comment Share on other sites More sharing options...
mhabich Posted February 11, 2019 Share Posted February 11, 2019 It looked to me that he'd plotted the tide stations around here, but not the current stations. He's from Seattle, and presumably hasn't put the time into it. A similar source is anyTide, an iOs/Android app with tides/currents around the UK. Quote Link to comment Share on other sites More sharing options...
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