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Post by carlf on Apr 11, 2023 6:33:45 GMT -5
Found this on the same page that has the HAB drifter data. This page depicts the tide and current patterns over the course of 4.5 days. Gives some really good visual depictions of how the tides and current change in certain locations over time. For example, it clearly shows that during a falling tide in Tampa Bay, the current at the Fort Desoto Gulf pier will flow south to north, and during an incoming tide in Tampa Bay, the current at the same location is north to south. Also shows the lag time in the currents as the tide slacks in either direction. Good stuff. ocgweb.marine.usf.edu/~tbm/index.htmlocgweb.marine.usf.edu/~tbm/tbcom.htmlZoom in to about 250% to get a really good view. Here is the text: Tampa Bay Coastal Ocean Model (TBCOM) is an application of the unstructured grid Finite Volume Community Ocean Model (FVCOM) to the Tampa Bay region, including Tampa Bay, Sarasota Bay, the Intra-Coastal Water Way, and all of the inlets connecting these water bodies with the adjacent Gulf of Mexico. TBCOM is nested within a larger domain West Florida Coastal Ocean Model (WFCOM) so that is downscales from the deeper Gulf of Mexico, across the West Florida Continental Shelf and into Tampa Bay. Shown above is a movie of TBCOM simulated surface currents and sea level (consisting of a one day hindcast and a three day nowcast/forecast) for a portion of the TBCOM domain. TBCOM is a fully three-dimensional, density dependent model simulating sea level, velocity, salinity and temperature. The above animation shows the hourly maps of surface currents and water levels during one nowcast/forecast model simulation cycle (4.5 days), which can also be viewed in an interactive movie.
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Post by fishfinderbill on Apr 11, 2023 20:26:48 GMT -5
Thanks for posting this although being a landlubber from Lakeland it doesn't make any sense to me. All I know is the tide charts for the pier that I see on line are usually off by 2 hrs.
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Post by inoeatfish on Apr 13, 2023 15:41:56 GMT -5
Thanks for posting this although being a landlubber from Lakeland it doesn't make any sense to me. All I know is the tide charts for the pier that I see on line are usually off by 2 hrs. [br Correct me if I’m wrong but the north pier is off by 2 hours and the south pier is off by 1 hour.
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Post by fishfinderbill on Apr 13, 2023 20:25:23 GMT -5
I fish South pier and 2hrs for me is about the norm. It really doesn't matter any more since I'm over an hour away and will enjoy ourselves no matter what the tides are doing.
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Post by carlf on Apr 14, 2023 7:44:55 GMT -5
"Thanks for posting this although being a landlubber from Lakeland it doesn't make any sense to me. All I know is the tide charts for the pier that I see on line are usually off by 2 hrs."
When you watch the animation, watch the arrows, the density of them and which way they point. They point in the direction of the current. The denser the arrows, the faster the current. When you see them stop, that's the top or bottom of the tide. Then they gradually switch direction and reverse the current.
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Post by Flatsrunner on Apr 14, 2023 8:31:18 GMT -5
Interesting how the tides seem to accumulate around Egmont key and pass, I guess that's why the tarpon seem to like it there, like a grocery store, I understand the density graphic but what does the length of the arrows mean?
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Post by fishsci on Apr 14, 2023 12:25:18 GMT -5
Thanks for posting this although being a landlubber from Lakeland it doesn't make any sense to me. All I know is the tide charts for the pier that I see on line are usually off by 2 hrs. ThIs issue has been discussed many times here. Yet some seem to continue to not understand it. High tide and change of current from incoming to outgoing are two very different things. Most fishermen care about the time that the current stopping and changing direction. Almost nobody cares if the water level continues to go up (or down) a couple inches for another hour or two. Think of it this way: when the water level in the Gulf is higher than in the bay, water keeps flowing into the bay. However the bay is very big, the mouth is narrow compared to the size of the bay, and there is friction that slows the water flowing into the bay. Thus, wen the tidal water level in the Gulf hits its highest point, the bay has yet to reach that level. Then when the water level at the mouth of the bay and the Gulf -- and the piers -- just starts to go lower, the current does not change to outgoing. The level at the mouth, however is still higher than in the bay, so water continues to flow into the bay because the main bay is not as high yet. The TIDE charts say when the water level is at its highest/lowest points. TIDE charts do not, in the case of a place near the mouth of a large bay, tell when the current changes from incoming to outgoing. If you, as most do, want to know which way the water will be flowing and when it will switch direction --- DO NOT USE A TIDE CHART. Fortunately, NOAA measures and accurately measures and predicts the current direction and speed at the ship channel (as an aid to the ship traffic). Unfortunately, they do not provide predictions days in advance, so you have to look at when the current switches yesterday, today and for a few more hours today. Usually you can get a good estimate by adding about 50 min per day for the next couple days. The NOAA site Is: tidesandcurrents.noaa.gov/ports/ports.html?id=t01010
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Post by Mackerelman on Apr 14, 2023 12:27:17 GMT -5
Interesting how the tides seem to accumulate around Egmont key and pass, I guess that's why the tarpon seem to like it there, like a grocery store, I understand the density graphic but what does the length of the arrows mean? The Arrows should represent the Direction of the Tide. The Longer Arrows should determine the length of the Tide. As of today-04/14/2023- at 1:29pm, it is a 2 Tide Day which the Longer Arrows should mean a Longer Tide. I may be wrong but I think that I am right. Anyone Correct Me if I may be wrong. Compare with the Site that Carlf Posted & uses with the Site that I use. tides4fishing.com/us/florida-gulf-coast/mullet-key-channel-skyway
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Post by fishsci on Apr 14, 2023 14:33:12 GMT -5
The arrows are the velocity of the water flow (not length of tide), and of course the direction of the arrow shows the direction of the flow. The length and direction of the arrows is technically is not the "tide". Tide is water flow/height caused by the gravity of the moon. On top of that, wind can make the water flow faster, slower, and in a different direction. So what the arrows in that modeled output are is a combination of tide and wind predicted at that particular time. For example, a 25 knt wind out of the NNE can hold the incoming tide back from changing to incoming for as much as an hour or two, depending on the tide that day. Plus, to complicate things even more, the atmospheric pressure can have a large effect also. I am sure that is included in the model that plots those arrows and water height (colors).
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