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Tidal question.

Old 07-28-2016, 06:35 PM
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Default Tidal question.

Is there a way to calculate when the tide change will hit a certain area inside an inlet other than local knowledge. I am specifically looking to find out how to determine what time the incoming as well as outgoing tides will hit certain area's in the Ponce Inlet area.

For example, I believe the low tide for Friday 7/29 in Ponce Inlet is forecast to be at 11:38 am, for the Inlet. If I want to know when the low tide will be at Inlet harbor which is about a 1/2 mile north of the inlet how do I determine that?

If that point is too close, then lets go north a few miles to the Dunlawton bridge which should be a few miles north of the inlet.

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Old 07-28-2016, 07:26 PM
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from what I've read they are "forecasts". A half mile, in my opinion is well within the forecast guestimations. i.e.: moon phase, wind, wind 100 miles away, etc. If it's possible, the best way is to observe two different colored waters move one way or the other. Some tide apps show amplitude which can translate into current speed.
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Old 07-28-2016, 08:14 PM
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Tide or current?

Have you consulted the Eldridge Tide and Pilot Book?
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Old 07-28-2016, 08:18 PM
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In NC, the creeks, ICW, etc inland from an inlet by a couple miles lags the beach high and low tide by around 45 minutes. Plus or minus a half hour!!!
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Old 07-29-2016, 04:51 AM
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Published tide cycles are basically the results of being measured over a long period of time, or interpolated between 2 known points for unpublished cycles. Many factors affect tides locally, so there is no universal formula for prediction. The only common factor is the lunar influence, which usually results in a 24 hour, 50 minute cycle period. This cycle is usually divided into 2 tides, but not always.
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Old 07-29-2016, 05:14 AM
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Get the $15 navionics app for your phone... zoom in on an area, find the nearest tide station and click on it. It will give current and future tides, as well as current speed.
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Old 07-29-2016, 05:15 AM
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Have the same issues here on the Chesapeake Bay, one side of the bay will be incoming and the other outgoing or vice versa or it will be right on, lots of dynamics in play here with it being such a large body of water......just when I think I have it figured out It will show me a whole other dynamic. Follow this thread to see what else is discussed......
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Old 07-29-2016, 05:16 AM
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It's about a 1 beer difference if you nurse it a little.

But really, it is just an estimate.
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Old 07-29-2016, 05:24 AM
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Dosent your GPS have tidal data for your location.
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Old 07-29-2016, 05:24 AM
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Total ripoff by Jay-Z. ;-)
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Old 07-29-2016, 05:47 AM
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If I was going to try to figure it out I'd try this. Bear in mind I'm just thinking out loud, or in this case through my keyboard.

Find the two tide stations that you're between. Then determine the time between those two stations. Then approximate you're distance to the closest one and either add or subtract 1/3, 1/4 or 1/2. That should get you close. But inland the ebb and flow of the water will be different due to the outside factors, bridges, wing dikes, sand bars, islands, sea walls and so on assuming you're parallel to the coast. If you're up stream on a river then that will be a different factor as well.

I don't know, hopefully this makes sense.
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