Tidal question.

Old 07-28-2016, 06:35 PM
Admirals Club Admiral's Club Member
Thread Starter
spraynet 1's Avatar
Join Date: Sep 2005
Location: Sanford, FL
Posts: 7,225
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.

spraynet 1 is online now  
Old 07-28-2016, 07:26 PM
Senior Member
Join Date: Nov 2009
Location: Jax, Fl
Posts: 4,071

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.
fijon is offline  
Old 07-28-2016, 08:14 PM
Senior Member
Join Date: Feb 2002
Location: NJ & MV
Posts: 3,837

Tide or current?

Have you consulted the Eldridge Tide and Pilot Book?
aubv is online now  
Old 07-28-2016, 08:18 PM
Senior Member
Join Date: Jun 2014
Location: Middle Sound, NC
Posts: 7,575

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!!!
Corndog38 is offline  
Old 07-29-2016, 04:51 AM
Senior Member
Join Date: Jan 2006
Location: Sunny florida
Posts: 23,041

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are basically the results of being measured over a long period of time, or interpolated between 2 known points for unpublished cycles.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.
billinstuart is offline  
Old 07-29-2016, 05:14 AM
Senior Member
Jughed's Avatar
Join Date: Mar 2009
Location: Rocky Point, N.E. River
Posts: 7,422

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.
Jughed is offline  
Old 07-29-2016, 05:15 AM
Senior MemberCaptains Club Member
Join Date: Aug 2008
Location: Chesapeake,Va
Posts: 1,575

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......
FlyingCircus is offline  
Old 07-29-2016, 05:16 AM
Senior MemberCaptains Club Member
Join Date: Aug 2006
Location: Central Florida
Posts: 8,245

It's about a 1 beer difference if you nurse it a little.

But really, it is just an estimate.
Sprockets is offline  
Old 07-29-2016, 05:24 AM
Senior Member
freeporttuna's Avatar
Join Date: Apr 2009
Location: Long Island
Posts: 9,897

Dosent your GPS have tidal data for your location.
freeporttuna is offline  
Old 07-29-2016, 05:24 AM
Senior Member
Join Date: Jun 2009
Location: Lake Murray, SC
Posts: 4,235

Total ripoff by Jay-Z. ;-)
jrolin1 is offline  
Old 07-29-2016, 05:47 AM
Senior MemberCaptains Club Member
Join Date: May 2004
Location: SE FL
Posts: 955

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.
NoWake200 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off

Thread Tools
Search this Thread